refactor: simplify and deduplicate across crud, metrics, cli, and

exceptions

README.md

@@ -44,7 +44,7 @@ uv add "fastapi-toolsets[all]"
 
 ### Core
 
-- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in search with relationship traversal
+- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in full-text/faceted search and Offset/Cursor pagination.
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration

docs/examples/pagination-search.md

@@ -0,0 +1,134 @@
+# Pagination & search
+
+This example builds an articles listing endpoint that supports **offset pagination**, **cursor pagination**, **full-text search**, **faceted filtering**, and **sorting** — all from a single `CrudFactory` definition.
+
+## Models
+
+```python title="models.py"
+--8<-- "docs_src/examples/pagination_search/models.py"
+```
+
+## Schemas
+
+```python title="schemas.py"
+--8<-- "docs_src/examples/pagination_search/schemas.py"
+```
+
+## Crud
+
+Declare `searchable_fields`, `facet_fields`, and `order_fields` once on [`CrudFactory`](../reference/crud.md#fastapi_toolsets.crud.factory.CrudFactory). All endpoints built from this class share the same defaults and can override them per call.
+
+```python title="crud.py"
+--8<-- "docs_src/examples/pagination_search/crud.py"
+```
+
+## Session dependency
+
+```python title="db.py"
+--8<-- "docs_src/examples/pagination_search/db.py"
+```
+
+!!! info "Deploy a Postgres DB with docker"
+    ```bash
+    docker run -d --name postgres -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=postgres -p 5432:5432 postgres:18-alpine
+    ```
+
+
+## App
+
+```python title="app.py"
+--8<-- "docs_src/examples/pagination_search/app.py"
+```
+
+
+## Routes
+### Offset pagination
+
+Best for admin panels or any UI that needs a total item count and numbered pages.
+
+```python title="routes.py:1:36"
+--8<-- "docs_src/examples/pagination_search/routes.py:1:36"
+```
+
+**Example request**
+
+```
+GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&order_by=title&order=asc
+```
+
+**Example response**
+
+```json
+{
+  "status": "SUCCESS",
+  "data": [
+    { "id": "3f47ac69-...", "title": "FastAPI tips", "status": "published", ... }
+  ],
+  "pagination": {
+    "total_count": 42,
+    "page": 2,
+    "items_per_page": 10,
+    "has_more": true
+  },
+  "filter_attributes": {
+    "status": ["archived", "draft", "published"],
+    "name": ["backend", "frontend", "python"]
+  }
+}
+```
+
+`filter_attributes` always reflects the values visible **after** applying the active filters. Use it to populate filter dropdowns on the client.
+
+### Cursor pagination
+
+Best for feeds, infinite scroll, or any high-throughput API where offset performance degrades.
+
+```python title="routes.py:39:59"
+--8<-- "docs_src/examples/pagination_search/routes.py:39:59"
+```
+
+**Example request**
+
+```
+GET /articles/cursor?items_per_page=10&status=published&order_by=created_at&order=desc
+```
+
+**Example response**
+
+```json
+{
+  "status": "SUCCESS",
+  "data": [
+    { "id": "3f47ac69-...", "title": "FastAPI tips", "status": "published", ... }
+  ],
+  "pagination": {
+    "next_cursor": "eyJ2YWx1ZSI6ICIzZjQ3YWM2OS0uLi4ifQ==",
+    "prev_cursor": null,
+    "items_per_page": 10,
+    "has_more": true
+  },
+  "filter_attributes": {
+    "status": ["published"],
+    "name": ["backend", "python"]
+  }
+}
+```
+
+Pass `next_cursor` as the `cursor` query parameter on the next request to advance to the next page.
+
+## Search behaviour
+
+Both endpoints inherit the same `searchable_fields` declared on `ArticleCrud`:
+
+Search is **case-insensitive** and uses a `LIKE %query%` pattern. Pass a [`SearchConfig`](../reference/crud.md#fastapi_toolsets.crud.search.SearchConfig) instead of a plain string to control case sensitivity or switch to `match_mode="all"` (AND across all fields instead of OR).
+
+```python
+from fastapi_toolsets.crud import SearchConfig
+
+# Both title AND body must contain "fastapi"
+result = await ArticleCrud.offset_paginate(
+    session,
+    search=SearchConfig(query="fastapi", case_sensitive=True, match_mode="all"),
+    search_fields=[Article.title, Article.body],
+)
+```

docs/index.md

@@ -44,7 +44,7 @@ uv add "fastapi-toolsets[all]"
 
 ### Core
 
-- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in search with relationship traversal
+- **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in full-text/faceted search and offset/cursor pagination.
 - **Database**: Session management, transaction helpers, table locking, and polling-based row change detection
 - **Dependencies**: FastAPI dependency factories (`PathDependency`, `BodyDependency`) for automatic DB lookups from path or body parameters
 - **Fixtures**: Fixture system with dependency management, context support, and pytest integration

docs/module/crud.md

@@ -95,9 +95,6 @@ The [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.Async
 }
 ```
 
-!!! warning "Deprecated: `paginate`"
-    The `paginate` function is a backward-compatible alias for `offset_paginate`. This function is **deprecated** and will be removed in **v2.0**.
-
 ### Cursor pagination
 
 ```python
@@ -168,7 +165,19 @@ PostCrud = CrudFactory(model=Post, cursor_column=Post.created_at)
 
 ## Search
 
-Declare searchable fields on the CRUD class. Relationship traversal is supported via tuples:
+Two search strategies are available, both compatible with [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate).
+
+| | Full-text search | Faceted search |
+|---|---|---|
+| Input | Free-text string | Exact column values |
+| Relationship support | Yes | Yes |
+| Use case | Search bars | Filter dropdowns |
+
+!!! info "You can use both search strategies in the same endpoint!"
+
+### Full-text search
+
+Declare `searchable_fields` on the CRUD class. Relationship traversal is supported via tuples:
 
 ```python
 PostCrud = CrudFactory(
@@ -181,6 +190,15 @@ PostCrud = CrudFactory(
 )
 ```
 
+You can override `searchable_fields` per call with `search_fields`:
+
+```python
+result = await UserCrud.offset_paginate(
+    session=session,
+    search_fields=[User.country],
+)
+```
+
 This allows searching with both [`offset_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.offset_paginate) and [`cursor_paginate`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.cursor_paginate):
 
 ```python
@@ -221,6 +239,141 @@ async def get_users(
     )
 ```
 
+### Faceted search
+
+!!! info "Added in `v1.2`"
+
+Declare `facet_fields` on the CRUD class to return distinct column values alongside paginated results. This is useful for populating filter dropdowns or building faceted search UIs.
+
+Facet fields use the same syntax as `searchable_fields` — direct columns or relationship tuples:
+
+```python
+UserCrud = CrudFactory(
+    model=User,
+    facet_fields=[
+        User.status,
+        User.country,
+        (User.role, Role.name),  # value from a related model
+    ],
+)
+```
+
+You can override `facet_fields` per call:
+
+```python
+result = await UserCrud.offset_paginate(
+    session=session,
+    facet_fields=[User.country],
+)
+```
+
+The distinct values are returned in the `filter_attributes` field of [`PaginatedResponse`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse):
+
+```json
+{
+  "status": "SUCCESS",
+  "data": ["..."],
+  "pagination": { "..." },
+  "filter_attributes": {
+    "status": ["active", "inactive"],
+    "country": ["DE", "FR", "US"],
+    "name": ["admin", "editor", "viewer"]
+  }
+}
+```
+
+Use `filter_by` to pass the client's chosen filter values directly — no need to build SQLAlchemy conditions by hand. Any unknown key raises [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError).
+
+!!! info "The keys in `filter_by` are the same keys the client received in `filter_attributes`."
+    Keys are normally the terminal `column.key` (e.g. `"name"` for `Role.name`). When two facet fields share the same column key (e.g. `(Build.project, Project.name)` and `(Build.os, Os.name)`), the relationship name is prepended automatically: `"project__name"` and `"os__name"`.
+
+`filter_by` and `filters` can be combined — both are applied with AND logic.
+
+Use [`filter_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.filter_params) to generate a dict with the facet filter values from the query parameters:
+
+```python
+from typing import Annotated
+
+from fastapi import Depends
+
+UserCrud = CrudFactory(
+    model=User,
+    facet_fields=[User.status, User.country, (User.role, Role.name)],
+)
+
+@router.get("", response_model_exclude_none=True)
+async def list_users(
+    session: SessionDep,
+    page: int = 1,
+    filter_by: Annotated[dict[str, list[str]], Depends(UserCrud.filter_params())],
+) -> PaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(
+        session=session,
+        page=page,
+        filter_by=filter_by,
+    )
+```
+
+Both single-value and multi-value query parameters work:
+
+```
+GET /users?status=active              → filter_by={"status": ["active"]}
+GET /users?status=active&country=FR   → filter_by={"status": ["active"], "country": ["FR"]}
+GET /users?role=admin&role=editor     → filter_by={"role": ["admin", "editor"]}  (IN clause)
+```
+
+## Sorting
+
+!!! info "Added in `v1.3`"
+
+Declare `order_fields` on the CRUD class to expose client-driven column ordering via `order_by` and `order` query parameters.
+
+```python
+UserCrud = CrudFactory(
+    model=User,
+    order_fields=[
+        User.name,
+        User.created_at,
+    ],
+)
+```
+
+Call [`order_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.order_params) to generate a FastAPI dependency that maps the query parameters to an [`OrderByClause`](../reference/crud.md#fastapi_toolsets.crud.factory.OrderByClause) expression:
+
+```python
+from typing import Annotated
+
+from fastapi import Depends
+from fastapi_toolsets.crud import OrderByClause
+
+@router.get("")
+async def list_users(
+    session: SessionDep,
+    order_by: Annotated[OrderByClause | None, Depends(UserCrud.order_params())],
+) -> PaginatedResponse[UserRead]:
+    return await UserCrud.offset_paginate(session=session, order_by=order_by)
+```
+
+The dependency adds two query parameters to the endpoint:
+
+| Parameter  | Type            |
+| ---------- | --------------- |
+| `order_by` | `str | null`   |
+| `order`    | `asc` or `desc` |
+
+```
+GET /users?order_by=name&order=asc   → ORDER BY users.name ASC
+GET /users?order_by=name&order=desc  → ORDER BY users.name DESC
+```
+
+An unknown `order_by` value raises [`InvalidOrderFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError) (HTTP 422).
+
+You can also pass `order_fields` directly to `order_params()` to override the class-level defaults without modifying them:
+
+```python
+UserOrderParams = UserCrud.order_params(order_fields=[User.name])
+```
+
 ## Relationship loading
 
 !!! info "Added in `v1.1`"
@@ -282,7 +435,7 @@ await UserCrud.upsert(
 )
 ```
 
-## `schema` — typed response serialization
+## Response serialization
 
 !!! info "Added in `v1.1`"
 
@@ -315,9 +468,6 @@ async def list_users(session: SessionDep, page: int = 1) -> PaginatedResponse[Us
 
 The schema must have `from_attributes=True` (or inherit from [`PydanticBase`](../reference/schemas.md#fastapi_toolsets.schemas.PydanticBase)) so it can be built from SQLAlchemy model instances.
 
-!!! warning "Deprecated: `as_response`"
-    The `as_response=True` parameter is **deprecated** and will be removed in **v2.0**. Replace it with `schema=YourSchema`.
-
 ---
 
 [:material-api: API Reference](../reference/crud.md)

docs/module/exceptions.md

@@ -34,6 +34,7 @@ This registers handlers for:
 | [`NotFoundError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NotFoundError) | 404 | Not found |
 | [`ConflictError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.ConflictError) | 409 | Conflict |
 | [`NoSearchableFieldsError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError) | 400 | No searchable fields |
+| [`InvalidFacetFilterError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError) | 400 | Invalid facet filter |
 
 ```python
 from fastapi_toolsets.exceptions import NotFoundError

docs/module/schemas.md

@@ -22,7 +22,7 @@ async def get_user(user: User = UserDep) -> Response[UserSchema]:
 
 ### [`PaginatedResponse[T]`](../reference/schemas.md#fastapi_toolsets.schemas.PaginatedResponse)
 
-Wraps a list of items with pagination metadata.
+Wraps a list of items with pagination metadata and optional facet values.
 
 ```python
 from fastapi_toolsets.schemas import PaginatedResponse, Pagination
@@ -40,6 +40,8 @@ async def list_users() -> PaginatedResponse[UserSchema]:
     )
 ```
 
+The optional `filter_attributes` field is populated when `facet_fields` are configured on the CRUD class (see [Filter attributes](crud.md#filter-attributes-facets)). It is `None` by default and can be hidden from API responses with `response_model_exclude_none=True`.
+
 ### [`ErrorResponse`](../reference/schemas.md#fastapi_toolsets.schemas.ErrorResponse)
 
 Returned automatically by the exceptions handler.

docs/reference/exceptions.md

@@ -12,6 +12,8 @@ from fastapi_toolsets.exceptions import (
     NotFoundError,
     ConflictError,
     NoSearchableFieldsError,
+    InvalidFacetFilterError,
+    InvalidOrderFieldError,
     generate_error_responses,
     init_exceptions_handlers,
 )
@@ -29,6 +31,10 @@ from fastapi_toolsets.exceptions import (
 
 ## ::: fastapi_toolsets.exceptions.exceptions.NoSearchableFieldsError
 
+## ::: fastapi_toolsets.exceptions.exceptions.InvalidFacetFilterError
+
+## ::: fastapi_toolsets.exceptions.exceptions.InvalidOrderFieldError
+
 ## ::: fastapi_toolsets.exceptions.exceptions.generate_error_responses
 
 ## ::: fastapi_toolsets.exceptions.handler.init_exceptions_handlers

docs_src/examples/pagination_search/app.py

@@ -0,0 +1,9 @@
+from fastapi import FastAPI
+
+from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+from .routes import router
+
+app = FastAPI()
+init_exceptions_handlers(app=app)
+app.include_router(router=router)

docs_src/examples/pagination_search/crud.py

@@ -0,0 +1,21 @@
+from fastapi_toolsets.crud import CrudFactory
+
+from .models import Article, Category
+
+ArticleCrud = CrudFactory(
+    model=Article,
+    cursor_column=Article.created_at,
+    searchable_fields=[  # default fields for full-text search
+        Article.title,
+        Article.body,
+        (Article.category, Category.name),
+    ],
+    facet_fields=[  # fields exposed as filter dropdowns
+        Article.status,
+        (Article.category, Category.name),
+    ],
+    order_fields=[  # fields exposed for client-driven ordering
+        Article.title,
+        Article.created_at,
+    ],
+)

docs_src/examples/pagination_search/db.py

@@ -0,0 +1,17 @@
+from typing import Annotated
+
+from fastapi import Depends
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from fastapi_toolsets.db import create_db_context, create_db_dependency
+
+DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost:5432/postgres"
+
+engine = create_async_engine(url=DATABASE_URL, future=True)
+async_session_maker = async_sessionmaker(bind=engine, expire_on_commit=False)
+
+get_db = create_db_dependency(session_maker=async_session_maker)
+get_db_context = create_db_context(session_maker=async_session_maker)
+
+
+SessionDep = Annotated[AsyncSession, Depends(get_db)]

docs_src/examples/pagination_search/models.py

@@ -0,0 +1,36 @@
+import datetime
+import uuid
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, func
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Category(Base):
+    __tablename__ = "categories"
+
+    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(64), unique=True)
+
+    articles: Mapped[list["Article"]] = relationship(back_populates="category")
+
+
+class Article(Base):
+    __tablename__ = "articles"
+
+    id: Mapped[uuid.UUID] = mapped_column(primary_key=True, default=uuid.uuid4)
+    created_at: Mapped[datetime.datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now()
+    )
+    title: Mapped[str] = mapped_column(String(256))
+    body: Mapped[str] = mapped_column(Text)
+    status: Mapped[str] = mapped_column(String(32))
+    published: Mapped[bool] = mapped_column(Boolean, default=False)
+    category_id: Mapped[uuid.UUID | None] = mapped_column(
+        ForeignKey("categories.id"), nullable=True
+    )
+
+    category: Mapped["Category | None"] = relationship(back_populates="articles")

docs_src/examples/pagination_search/routes.py

@@ -0,0 +1,59 @@
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, Query
+
+from fastapi_toolsets.crud import OrderByClause
+from fastapi_toolsets.schemas import PaginatedResponse
+
+from .crud import ArticleCrud
+from .db import SessionDep
+from .models import Article
+from .schemas import ArticleRead
+
+router = APIRouter(prefix="/articles")
+
+
+@router.get("/offset")
+async def list_articles_offset(
+    session: SessionDep,
+    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
+    order_by: Annotated[
+        OrderByClause | None,
+        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    ],
+    page: int = Query(1, ge=1),
+    items_per_page: int = Query(20, ge=1, le=100),
+    search: str | None = None,
+) -> PaginatedResponse[ArticleRead]:
+    return await ArticleCrud.offset_paginate(
+        session=session,
+        page=page,
+        items_per_page=items_per_page,
+        search=search,
+        filter_by=filter_by or None,
+        order_by=order_by,
+        schema=ArticleRead,
+    )
+
+
+@router.get("/cursor")
+async def list_articles_cursor(
+    session: SessionDep,
+    filter_by: Annotated[dict[str, list[str]], Depends(ArticleCrud.filter_params())],
+    order_by: Annotated[
+        OrderByClause | None,
+        Depends(ArticleCrud.order_params(default_field=Article.created_at)),
+    ],
+    cursor: str | None = None,
+    items_per_page: int = Query(20, ge=1, le=100),
+    search: str | None = None,
+) -> PaginatedResponse[ArticleRead]:
+    return await ArticleCrud.cursor_paginate(
+        session=session,
+        cursor=cursor,
+        items_per_page=items_per_page,
+        search=search,
+        filter_by=filter_by or None,
+        order_by=order_by,
+        schema=ArticleRead,
+    )

docs_src/examples/pagination_search/schemas.py

@@ -0,0 +1,13 @@
+import datetime
+import uuid
+
+from fastapi_toolsets.schemas import PydanticBase
+
+
+class ArticleRead(PydanticBase):
+    id: uuid.UUID
+    created_at: datetime.datetime
+    title: str
+    status: str
+    published: bool
+    category_id: uuid.UUID | None

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "fastapi-toolsets"
-version = "1.1.2"
+version = "1.3.0"
-description = "Reusable tools for FastAPI: async CRUD, fixtures, CLI, and standardized responses for SQLAlchemy + PostgreSQL"
+description = "Production-ready utilities for FastAPI applications"
 readme = "README.md"
 license = "MIT"
 license-files = ["LICENSE"]
@@ -11,7 +11,7 @@ authors = [
 ]
 keywords = ["fastapi", "sqlalchemy", "postgresql"]
 classifiers = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 5 - Production/Stable",
     "Framework :: AsyncIO",
     "Framework :: FastAPI",
     "Framework :: Pydantic",

src/fastapi_toolsets/__init__.py

@@ -21,4 +21,4 @@ Example usage:
         return Response(data={"user": user.username}, message="Success")
 """
 
-__version__ = "1.1.2"
+__version__ = "1.3.0"

src/fastapi_toolsets/cli/commands/fixtures.py

@@ -72,7 +72,7 @@ async def load(
     registry = get_fixtures_registry()
     db_context = get_db_context()
 
-    context_list = [c.value for c in contexts] if contexts else [Context.BASE]
+    context_list = list(contexts) if contexts else [Context.BASE]
 
     ordered = registry.resolve_context_dependencies(*context_list)
 

src/fastapi_toolsets/crud/__init__.py

@@ -1,17 +1,18 @@
 """Generic async CRUD operations for SQLAlchemy models."""
 
-from ..exceptions import NoSearchableFieldsError
+from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
-from .factory import CrudFactory, JoinType, M2MFieldType
+from ..types import FacetFieldType, JoinType, M2MFieldType, OrderByClause
-from .search import (
+from .factory import CrudFactory
-    SearchConfig,
+from .search import SearchConfig, get_searchable_fields
-    get_searchable_fields,
-)
 
 __all__ = [
     "CrudFactory",
+    "FacetFieldType",
     "get_searchable_fields",
+    "InvalidFacetFilterError",
     "JoinType",
     "M2MFieldType",
     "NoSearchableFieldsError",
+    "OrderByClause",
     "SearchConfig",
 ]

src/fastapi_toolsets/crud/factory.py

@@ -3,14 +3,15 @@
 from __future__ import annotations
 
 import base64
+import inspect
 import json
 import uuid as uuid_module
-import warnings
+from collections.abc import Awaitable, Callable, Sequence
-from collections.abc import Mapping, Sequence
 from datetime import date, datetime
 from decimal import Decimal
-from typing import Any, ClassVar, Generic, Literal, Self, TypeVar, cast, overload
+from typing import Any, ClassVar, Generic, Literal, Self, cast, overload
 
+from fastapi import Query
 from pydantic import BaseModel
 from sqlalchemy import Date, DateTime, Float, Integer, Numeric, Uuid, and_, func, select
 from sqlalchemy import delete as sql_delete
@@ -22,14 +23,24 @@ from sqlalchemy.sql.base import ExecutableOption
 from sqlalchemy.sql.roles import WhereHavingRole
 
 from ..db import get_transaction
-from ..exceptions import NotFoundError
+from ..exceptions import InvalidOrderFieldError, NotFoundError
 from ..schemas import CursorPagination, OffsetPagination, PaginatedResponse, Response
-from .search import SearchConfig, SearchFieldType, build_search_filters
+from ..types import (
-
+    FacetFieldType,
-ModelType = TypeVar("ModelType", bound=DeclarativeBase)
+    JoinType,
-SchemaType = TypeVar("SchemaType", bound=BaseModel)
+    M2MFieldType,
-JoinType = list[tuple[type[DeclarativeBase], Any]]
+    ModelType,
-M2MFieldType = Mapping[str, QueryableAttribute[Any]]
+    OrderByClause,
+    SchemaType,
+    SearchFieldType,
+)
+from .search import (
+    SearchConfig,
+    build_facets,
+    build_filter_by,
+    build_search_filters,
+    facet_keys,
+)
 
 
 def _encode_cursor(value: Any) -> str:
@@ -42,6 +53,22 @@ def _decode_cursor(cursor: str) -> str:
     return json.loads(base64.b64decode(cursor.encode()).decode())
 
 
+def _apply_joins(q: Any, joins: JoinType | None, outer_join: bool) -> Any:
+    """Apply a list of (model, condition) joins to a SQLAlchemy select query."""
+    if not joins:
+        return q
+    for model, condition in joins:
+        q = q.outerjoin(model, condition) if outer_join else q.join(model, condition)
+    return q
+
+
+def _apply_search_joins(q: Any, search_joins: list[Any]) -> Any:
+    """Apply relationship-based outer joins (from search/filter_by) to a query."""
+    for join_rel in search_joins:
+        q = q.outerjoin(join_rel)
+    return q
+
+
 class AsyncCrud(Generic[ModelType]):
     """Generic async CRUD operations for SQLAlchemy models.
 
@@ -50,6 +77,8 @@ class AsyncCrud(Generic[ModelType]):
 
     model: ClassVar[type[DeclarativeBase]]
     searchable_fields: ClassVar[Sequence[SearchFieldType] | None] = None
+    facet_fields: ClassVar[Sequence[FacetFieldType] | None] = None
+    order_fields: ClassVar[Sequence[QueryableAttribute[Any]] | None] = None
     m2m_fields: ClassVar[M2MFieldType | None] = None
     default_load_options: ClassVar[list[ExecutableOption] | None] = None
     cursor_column: ClassVar[Any | None] = None
@@ -119,6 +148,151 @@ class AsyncCrud(Generic[ModelType]):
             return set()
         return set(cls.m2m_fields.keys())
 
+    @classmethod
+    def _resolve_facet_fields(
+        cls: type[Self],
+        facet_fields: Sequence[FacetFieldType] | None,
+    ) -> Sequence[FacetFieldType] | None:
+        """Return facet_fields if given, otherwise fall back to the class-level default."""
+        return facet_fields if facet_fields is not None else cls.facet_fields
+
+    @classmethod
+    def _prepare_filter_by(
+        cls: type[Self],
+        filter_by: dict[str, Any] | BaseModel | None,
+        facet_fields: Sequence[FacetFieldType] | None,
+    ) -> tuple[list[Any], list[Any]]:
+        """Normalize filter_by and return (filters, joins) to apply to the query."""
+        if isinstance(filter_by, BaseModel):
+            filter_by = filter_by.model_dump(exclude_none=True)
+        if not filter_by:
+            return [], []
+        resolved = cls._resolve_facet_fields(facet_fields)
+        return build_filter_by(filter_by, resolved or [])
+
+    @classmethod
+    async def _build_filter_attributes(
+        cls: type[Self],
+        session: AsyncSession,
+        facet_fields: Sequence[FacetFieldType] | None,
+        filters: list[Any],
+        search_joins: list[Any],
+    ) -> dict[str, list[Any]] | None:
+        """Build facet filter_attributes, or return None if no facet fields configured."""
+        resolved = cls._resolve_facet_fields(facet_fields)
+        if not resolved:
+            return None
+        return await build_facets(
+            session,
+            cls.model,
+            resolved,
+            base_filters=filters,
+            base_joins=search_joins,
+        )
+
+    @classmethod
+    def filter_params(
+        cls: type[Self],
+        *,
+        facet_fields: Sequence[FacetFieldType] | None = None,
+    ) -> Callable[..., Awaitable[dict[str, list[str]]]]:
+        """Return a FastAPI dependency that collects facet filter values from query parameters.
+        Args:
+            facet_fields: Override the facet fields for this dependency. Falls back to the
+                class-level ``facet_fields`` if not provided.
+
+        Returns:
+            An async dependency function named ``{Model}FilterParams`` that resolves to a
+            ``dict[str, list[str]]`` containing only the keys that were supplied in the
+            request (absent/``None`` parameters are excluded).
+
+        Raises:
+            ValueError: If no facet fields are configured on this CRUD class and none are
+                provided via ``facet_fields``.
+        """
+        fields = cls._resolve_facet_fields(facet_fields)
+        if not fields:
+            raise ValueError(
+                f"{cls.__name__} has no facet_fields configured. "
+                "Pass facet_fields= or set them on CrudFactory."
+            )
+        keys = facet_keys(fields)
+
+        async def dependency(**kwargs: Any) -> dict[str, list[str]]:
+            return {k: v for k, v in kwargs.items() if v is not None}
+
+        dependency.__name__ = f"{cls.model.__name__}FilterParams"
+        dependency.__signature__ = inspect.Signature(  # type: ignore[attr-defined]
+            parameters=[
+                inspect.Parameter(
+                    k,
+                    inspect.Parameter.KEYWORD_ONLY,
+                    annotation=list[str] | None,
+                    default=Query(default=None),
+                )
+                for k in keys
+            ]
+        )
+
+        return dependency
+
+    @classmethod
+    def order_params(
+        cls: type[Self],
+        *,
+        order_fields: Sequence[QueryableAttribute[Any]] | None = None,
+        default_field: QueryableAttribute[Any] | None = None,
+        default_order: Literal["asc", "desc"] = "asc",
+    ) -> Callable[..., Awaitable[OrderByClause | None]]:
+        """Return a FastAPI dependency that resolves order query params into an order_by clause.
+
+        Args:
+            order_fields: Override the allowed order fields. Falls back to the class-level
+                ``order_fields`` if not provided.
+            default_field: Field to order by when ``order_by`` query param is absent.
+                If ``None`` and no ``order_by`` is provided, no ordering is applied.
+            default_order: Default order direction when ``order`` is absent
+                (``"asc"`` or ``"desc"``).
+
+        Returns:
+            An async dependency function named ``{Model}OrderParams`` that resolves to an
+            ``OrderByClause`` (or ``None``). Pass it to ``Depends()`` in your route.
+
+        Raises:
+            ValueError: If no order fields are configured on this CRUD class and none are
+                provided via ``order_fields``.
+            InvalidOrderFieldError: When the request provides an unknown ``order_by`` value.
+        """
+        fields = order_fields if order_fields is not None else cls.order_fields
+        if not fields:
+            raise ValueError(
+                f"{cls.__name__} has no order_fields configured. "
+                "Pass order_fields= or set them on CrudFactory."
+            )
+        field_map: dict[str, QueryableAttribute[Any]] = {f.key: f for f in fields}
+        valid_keys = sorted(field_map.keys())
+
+        async def dependency(
+            order_by: str | None = Query(
+                None, description=f"Field to order by. Valid values: {valid_keys}"
+            ),
+            order: Literal["asc", "desc"] = Query(
+                default_order, description="Sort direction"
+            ),
+        ) -> OrderByClause | None:
+            if order_by is None:
+                if default_field is None:
+                    return None
+                field = default_field
+            elif order_by not in field_map:
+                raise InvalidOrderFieldError(order_by, valid_keys)
+            else:
+                field = field_map[order_by]
+            return field.asc() if order == "asc" else field.desc()
+
+        dependency.__name__ = f"{cls.model.__name__}OrderParams"
+        return dependency
+
     @overload
     @classmethod
     async def create(  # pragma: no cover
@@ -127,10 +301,8 @@ class AsyncCrud(Generic[ModelType]):
         obj: BaseModel,
         *,
         schema: type[SchemaType],
-        as_response: bool = ...,
     ) -> Response[SchemaType]: ...
 
-    # Backward-compatible - will be removed in v2.0
     @overload
     @classmethod
     async def create(  # pragma: no cover
@@ -138,18 +310,6 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         obj: BaseModel,
         *,
-        as_response: Literal[True],
-        schema: None = ...,
-    ) -> Response[ModelType]: ...
-
-    @overload
-    @classmethod
-    async def create(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        obj: BaseModel,
-        *,
-        as_response: Literal[False] = ...,
         schema: None = ...,
     ) -> ModelType: ...
 
@@ -159,29 +319,19 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         obj: BaseModel,
         *,
-        as_response: bool = False,
         schema: type[BaseModel] | None = None,
-    ) -> ModelType | Response[ModelType] | Response[Any]:
+    ) -> ModelType | Response[Any]:
         """Create a new record in the database.
 
         Args:
             session: DB async session
             obj: Pydantic model with data to create
-            as_response: Deprecated. Use ``schema`` instead. Will be removed in v2.0.
             schema: Pydantic schema to serialize the result into. When provided,
                 the result is automatically wrapped in a ``Response[schema]``.
 
         Returns:
-            Created model instance, or ``Response[schema]`` when ``schema`` is given,
+            Created model instance, or ``Response[schema]`` when ``schema`` is given.
-            or ``Response[ModelType]`` when ``as_response=True`` (deprecated).
         """
-        if as_response and schema is None:
-            warnings.warn(
-                "as_response is deprecated and will be removed in v2.0. "
-                "Use schema=YourSchema instead.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
         async with get_transaction(session):
             m2m_exclude = cls._m2m_schema_fields()
             data = (
@@ -197,9 +347,8 @@ class AsyncCrud(Generic[ModelType]):
             session.add(db_model)
         await session.refresh(db_model)
         result = cast(ModelType, db_model)
-        if as_response or schema:
+        if schema:
-            data_out = schema.model_validate(result) if schema else result
+            return Response(data=schema.model_validate(result))
-            return Response(data=data_out)
         return result
 
     @overload
@@ -214,10 +363,8 @@ class AsyncCrud(Generic[ModelType]):
         with_for_update: bool = False,
         load_options: list[ExecutableOption] | None = None,
         schema: type[SchemaType],
-        as_response: bool = ...,
     ) -> Response[SchemaType]: ...
 
-    # Backward-compatible - will be removed in v2.0
     @overload
     @classmethod
     async def get(  # pragma: no cover
@@ -229,22 +376,6 @@ class AsyncCrud(Generic[ModelType]):
         outer_join: bool = False,
         with_for_update: bool = False,
         load_options: list[ExecutableOption] | None = None,
-        as_response: Literal[True],
-        schema: None = ...,
-    ) -> Response[ModelType]: ...
-
-    @overload
-    @classmethod
-    async def get(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        filters: list[Any],
-        *,
-        joins: JoinType | None = None,
-        outer_join: bool = False,
-        with_for_update: bool = False,
-        load_options: list[ExecutableOption] | None = None,
-        as_response: Literal[False] = ...,
         schema: None = ...,
     ) -> ModelType: ...
 
@@ -258,9 +389,8 @@ class AsyncCrud(Generic[ModelType]):
         outer_join: bool = False,
         with_for_update: bool = False,
         load_options: list[ExecutableOption] | None = None,
-        as_response: bool = False,
         schema: type[BaseModel] | None = None,
-    ) -> ModelType | Response[ModelType] | Response[Any]:
+    ) -> ModelType | Response[Any]:
         """Get exactly one record. Raises NotFoundError if not found.
 
         Args:
@@ -270,33 +400,18 @@ class AsyncCrud(Generic[ModelType]):
             outer_join: Use LEFT OUTER JOIN instead of INNER JOIN
             with_for_update: Lock the row for update
             load_options: SQLAlchemy loader options (e.g., selectinload)
-            as_response: Deprecated. Use ``schema`` instead. Will be removed in v2.0.
             schema: Pydantic schema to serialize the result into. When provided,
                 the result is automatically wrapped in a ``Response[schema]``.
 
         Returns:
-            Model instance, or ``Response[schema]`` when ``schema`` is given,
+            Model instance, or ``Response[schema]`` when ``schema`` is given.
-            or ``Response[ModelType]`` when ``as_response=True`` (deprecated).
 
         Raises:
             NotFoundError: If no record found
             MultipleResultsFound: If more than one record found
         """
-        if as_response and schema is None:
-            warnings.warn(
-                "as_response is deprecated and will be removed in v2.0. "
-                "Use schema=YourSchema instead.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
         q = select(cls.model)
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
         q = q.where(and_(*filters))
         if resolved := cls._resolve_load_options(load_options):
             q = q.options(*resolved)
@@ -307,9 +422,8 @@ class AsyncCrud(Generic[ModelType]):
         if not item:
             raise NotFoundError()
         result = cast(ModelType, item)
-        if as_response or schema:
+        if schema:
-            data_out = schema.model_validate(result) if schema else result
+            return Response(data=schema.model_validate(result))
-            return Response(data=data_out)
         return result
 
     @classmethod
@@ -335,13 +449,7 @@ class AsyncCrud(Generic[ModelType]):
             Model instance or None
         """
         q = select(cls.model)
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
         if filters:
             q = q.where(and_(*filters))
         if resolved := cls._resolve_load_options(load_options):
@@ -358,7 +466,7 @@ class AsyncCrud(Generic[ModelType]):
         joins: JoinType | None = None,
         outer_join: bool = False,
         load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
+        order_by: OrderByClause | None = None,
         limit: int | None = None,
         offset: int | None = None,
     ) -> Sequence[ModelType]:
@@ -378,13 +486,7 @@ class AsyncCrud(Generic[ModelType]):
             List of model instances
         """
         q = select(cls.model)
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
         if filters:
             q = q.where(and_(*filters))
         if resolved := cls._resolve_load_options(load_options):
@@ -409,10 +511,8 @@ class AsyncCrud(Generic[ModelType]):
         exclude_unset: bool = True,
         exclude_none: bool = False,
         schema: type[SchemaType],
-        as_response: bool = ...,
     ) -> Response[SchemaType]: ...
 
-    # Backward-compatible - will be removed in v2.0
     @overload
     @classmethod
     async def update(  # pragma: no cover
@@ -423,21 +523,6 @@ class AsyncCrud(Generic[ModelType]):
         *,
         exclude_unset: bool = True,
         exclude_none: bool = False,
-        as_response: Literal[True],
-        schema: None = ...,
-    ) -> Response[ModelType]: ...
-
-    @overload
-    @classmethod
-    async def update(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        obj: BaseModel,
-        filters: list[Any],
-        *,
-        exclude_unset: bool = True,
-        exclude_none: bool = False,
-        as_response: Literal[False] = ...,
         schema: None = ...,
     ) -> ModelType: ...
 
@@ -450,9 +535,8 @@ class AsyncCrud(Generic[ModelType]):
         *,
         exclude_unset: bool = True,
         exclude_none: bool = False,
-        as_response: bool = False,
         schema: type[BaseModel] | None = None,
-    ) -> ModelType | Response[ModelType] | Response[Any]:
+    ) -> ModelType | Response[Any]:
         """Update a record in the database.
 
         Args:
@@ -461,24 +545,15 @@ class AsyncCrud(Generic[ModelType]):
             filters: List of SQLAlchemy filter conditions
             exclude_unset: Exclude fields not explicitly set in the schema
             exclude_none: Exclude fields with None value
-            as_response: Deprecated. Use ``schema`` instead. Will be removed in v2.0.
             schema: Pydantic schema to serialize the result into. When provided,
                 the result is automatically wrapped in a ``Response[schema]``.
 
         Returns:
-            Updated model instance, or ``Response[schema]`` when ``schema`` is given,
+            Updated model instance, or ``Response[schema]`` when ``schema`` is given.
-            or ``Response[ModelType]`` when ``as_response=True`` (deprecated).
 
         Raises:
             NotFoundError: If no record found
         """
-        if as_response and schema is None:
-            warnings.warn(
-                "as_response is deprecated and will be removed in v2.0. "
-                "Use schema=YourSchema instead.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
         async with get_transaction(session):
             m2m_exclude = cls._m2m_schema_fields()
 
@@ -508,9 +583,8 @@ class AsyncCrud(Generic[ModelType]):
                 for rel_attr, related_instances in m2m_resolved.items():
                     setattr(db_model, rel_attr, related_instances)
         await session.refresh(db_model)
-        if as_response or schema:
+        if schema:
-            data_out = schema.model_validate(db_model) if schema else db_model
+            return Response(data=schema.model_validate(db_model))
-            return Response(data=data_out)
         return db_model
 
     @classmethod
@@ -566,7 +640,7 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         filters: list[Any],
         *,
-        as_response: Literal[True],
+        return_response: Literal[True],
     ) -> Response[None]: ...
 
     @overload
@@ -576,8 +650,8 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         filters: list[Any],
         *,
-        as_response: Literal[False] = ...,
+        return_response: Literal[False] = ...,
-    ) -> bool: ...
+    ) -> None: ...
 
     @classmethod
     async def delete(
@@ -585,33 +659,26 @@ class AsyncCrud(Generic[ModelType]):
         session: AsyncSession,
         filters: list[Any],
         *,
-        as_response: bool = False,
+        return_response: bool = False,
-    ) -> bool | Response[None]:
+    ) -> None | Response[None]:
         """Delete records from the database.
 
         Args:
             session: DB async session
             filters: List of SQLAlchemy filter conditions
-            as_response: Deprecated. Will be removed in v2.0. When ``True``,
+            return_response: When ``True``, returns ``Response[None]`` instead
-                returns ``Response[None]`` instead of ``bool``.
+                of ``None``. Useful for API endpoints that expect a consistent
+                response envelope.
 
         Returns:
-            ``True`` if deletion was executed, or ``Response[None]`` when
+            ``None``, or ``Response[None]`` when ``return_response=True``.
-            ``as_response=True`` (deprecated).
         """
-        if as_response:
-            warnings.warn(
-                "as_response is deprecated and will be removed in v2.0. "
-                "Use schema=YourSchema instead.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
         async with get_transaction(session):
             q = sql_delete(cls.model).where(and_(*filters))
             await session.execute(q)
-        if as_response:
+        if return_response:
             return Response(data=None)
-        return True
+        return None
 
     @classmethod
     async def count(
@@ -634,13 +701,7 @@ class AsyncCrud(Generic[ModelType]):
             Number of matching records
         """
         q = select(func.count()).select_from(cls.model)
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
         if filters:
             q = q.where(and_(*filters))
         result = await session.execute(q)
@@ -667,54 +728,11 @@ class AsyncCrud(Generic[ModelType]):
             True if at least one record matches
         """
         q = select(cls.model)
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
         q = q.where(and_(*filters)).exists().select()
         result = await session.execute(q)
         return bool(result.scalar())
 
-    @overload
-    @classmethod
-    async def offset_paginate(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        *,
-        filters: list[Any] | None = None,
-        joins: JoinType | None = None,
-        outer_join: bool = False,
-        load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
-        page: int = 1,
-        items_per_page: int = 20,
-        search: str | SearchConfig | None = None,
-        search_fields: Sequence[SearchFieldType] | None = None,
-        schema: type[SchemaType],
-    ) -> PaginatedResponse[SchemaType]: ...
-
-    # Backward-compatible - will be removed in v2.0
-    @overload
-    @classmethod
-    async def offset_paginate(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        *,
-        filters: list[Any] | None = None,
-        joins: JoinType | None = None,
-        outer_join: bool = False,
-        load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
-        page: int = 1,
-        items_per_page: int = 20,
-        search: str | SearchConfig | None = None,
-        search_fields: Sequence[SearchFieldType] | None = None,
-        schema: None = ...,
-    ) -> PaginatedResponse[ModelType]: ...
-
     @classmethod
     async def offset_paginate(
         cls: type[Self],
@@ -724,13 +742,15 @@ class AsyncCrud(Generic[ModelType]):
         joins: JoinType | None = None,
         outer_join: bool = False,
         load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
+        order_by: OrderByClause | None = None,
         page: int = 1,
         items_per_page: int = 20,
         search: str | SearchConfig | None = None,
         search_fields: Sequence[SearchFieldType] | None = None,
-        schema: type[BaseModel] | None = None,
+        facet_fields: Sequence[FacetFieldType] | None = None,
-    ) -> PaginatedResponse[ModelType] | PaginatedResponse[Any]:
+        filter_by: dict[str, Any] | BaseModel | None = None,
+        schema: type[BaseModel],
+    ) -> PaginatedResponse[Any]:
         """Get paginated results using offset-based pagination.
 
         Args:
@@ -744,40 +764,40 @@ class AsyncCrud(Generic[ModelType]):
             items_per_page: Number of items per page
             search: Search query string or SearchConfig object
             search_fields: Fields to search in (overrides class default)
-            schema: Optional Pydantic schema to serialize each item into.
+            facet_fields: Columns to compute distinct values for (overrides class default)
+            filter_by: Dict of {column_key: value} to filter by declared facet fields.
+                Keys must match the column.key of a facet field. Scalar → equality,
+                list → IN clause. Raises InvalidFacetFilterError for unknown keys.
+            schema: Pydantic schema to serialize each item into.
 
         Returns:
             PaginatedResponse with OffsetPagination metadata
         """
         filters = list(filters) if filters else []
         offset = (page - 1) * items_per_page
-        search_joins: list[Any] = []
+
+        fb_filters, search_joins = cls._prepare_filter_by(filter_by, facet_fields)
+        filters.extend(fb_filters)
 
         # Build search filters
         if search:
-            search_filters, search_joins = build_search_filters(
+            search_filters, new_search_joins = build_search_filters(
                 cls.model,
                 search,
                 search_fields=search_fields,
                 default_fields=cls.searchable_fields,
             )
             filters.extend(search_filters)
+            search_joins.extend(new_search_joins)
 
         # Build query with joins
         q = select(cls.model)
 
         # Apply explicit joins
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
 
         # Apply search joins (always outer joins for search)
-        for join_rel in search_joins:
+        q = _apply_search_joins(q, search_joins)
-            q = q.outerjoin(join_rel)
 
         if filters:
             q = q.where(and_(*filters))
@@ -789,9 +809,7 @@ class AsyncCrud(Generic[ModelType]):
         q = q.offset(offset).limit(items_per_page)
         result = await session.execute(q)
         raw_items = cast(list[ModelType], result.unique().scalars().all())
-        items: list[Any] = (
+        items: list[Any] = [schema.model_validate(item) for item in raw_items]
-            [schema.model_validate(item) for item in raw_items] if schema else raw_items
-        )
 
         # Count query (with same joins and filters)
         pk_col = cls.model.__mapper__.primary_key[0]
@@ -799,17 +817,10 @@ class AsyncCrud(Generic[ModelType]):
         count_q = count_q.select_from(cls.model)
 
         # Apply explicit joins to count query
-        if joins:
+        count_q = _apply_joins(count_q, joins, outer_join)
-            for model, condition in joins:
-                count_q = (
-                    count_q.outerjoin(model, condition)
-                    if outer_join
-                    else count_q.join(model, condition)
-                )
 
         # Apply search joins to count query
-        for join_rel in search_joins:
+        count_q = _apply_search_joins(count_q, search_joins)
-            count_q = count_q.outerjoin(join_rel)
 
         if filters:
             count_q = count_q.where(and_(*filters))
@@ -817,6 +828,10 @@ class AsyncCrud(Generic[ModelType]):
         count_result = await session.execute(count_q)
         total_count = count_result.scalar_one()
 
+        filter_attributes = await cls._build_filter_attributes(
+            session, facet_fields, filters, search_joins
+        )
+
         return PaginatedResponse(
             data=items,
             pagination=OffsetPagination(
@@ -825,48 +840,9 @@ class AsyncCrud(Generic[ModelType]):
                 page=page,
                 has_more=page * items_per_page < total_count,
             ),
+            filter_attributes=filter_attributes,
         )
 
-    # Backward-compatible - will be removed in v2.0
-    paginate = offset_paginate
-
-    @overload
-    @classmethod
-    async def cursor_paginate(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        *,
-        cursor: str | None = None,
-        filters: list[Any] | None = None,
-        joins: JoinType | None = None,
-        outer_join: bool = False,
-        load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
-        items_per_page: int = 20,
-        search: str | SearchConfig | None = None,
-        search_fields: Sequence[SearchFieldType] | None = None,
-        schema: type[SchemaType],
-    ) -> PaginatedResponse[SchemaType]: ...
-
-    # Backward-compatible - will be removed in v2.0
-    @overload
-    @classmethod
-    async def cursor_paginate(  # pragma: no cover
-        cls: type[Self],
-        session: AsyncSession,
-        *,
-        cursor: str | None = None,
-        filters: list[Any] | None = None,
-        joins: JoinType | None = None,
-        outer_join: bool = False,
-        load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
-        items_per_page: int = 20,
-        search: str | SearchConfig | None = None,
-        search_fields: Sequence[SearchFieldType] | None = None,
-        schema: None = ...,
-    ) -> PaginatedResponse[ModelType]: ...
-
     @classmethod
     async def cursor_paginate(
         cls: type[Self],
@@ -877,12 +853,14 @@ class AsyncCrud(Generic[ModelType]):
         joins: JoinType | None = None,
         outer_join: bool = False,
         load_options: list[ExecutableOption] | None = None,
-        order_by: Any | None = None,
+        order_by: OrderByClause | None = None,
         items_per_page: int = 20,
         search: str | SearchConfig | None = None,
         search_fields: Sequence[SearchFieldType] | None = None,
-        schema: type[BaseModel] | None = None,
+        facet_fields: Sequence[FacetFieldType] | None = None,
-    ) -> PaginatedResponse[ModelType] | PaginatedResponse[Any]:
+        filter_by: dict[str, Any] | BaseModel | None = None,
+        schema: type[BaseModel],
+    ) -> PaginatedResponse[Any]:
         """Get paginated results using cursor-based pagination.
 
         Args:
@@ -899,13 +877,19 @@ class AsyncCrud(Generic[ModelType]):
             items_per_page: Number of items per page (default 20).
             search: Search query string or SearchConfig object.
             search_fields: Fields to search in (overrides class default).
+            facet_fields: Columns to compute distinct values for (overrides class default).
+            filter_by: Dict of {column_key: value} to filter by declared facet fields.
+                Keys must match the column.key of a facet field. Scalar → equality,
+                list → IN clause. Raises InvalidFacetFilterError for unknown keys.
             schema: Optional Pydantic schema to serialize each item into.
 
         Returns:
             PaginatedResponse with CursorPagination metadata
         """
         filters = list(filters) if filters else []
-        search_joins: list[Any] = []
+
+        fb_filters, search_joins = cls._prepare_filter_by(filter_by, facet_fields)
+        filters.extend(fb_filters)
 
         if cls.cursor_column is None:
             raise ValueError(
@@ -938,29 +922,23 @@ class AsyncCrud(Generic[ModelType]):
 
         # Build search filters
         if search:
-            search_filters, search_joins = build_search_filters(
+            search_filters, new_search_joins = build_search_filters(
                 cls.model,
                 search,
                 search_fields=search_fields,
                 default_fields=cls.searchable_fields,
             )
             filters.extend(search_filters)
+            search_joins.extend(new_search_joins)
 
         # Build query
         q = select(cls.model)
 
         # Apply explicit joins
-        if joins:
+        q = _apply_joins(q, joins, outer_join)
-            for model, condition in joins:
-                q = (
-                    q.outerjoin(model, condition)
-                    if outer_join
-                    else q.join(model, condition)
-                )
 
         # Apply search joins (always outer joins)
-        for join_rel in search_joins:
+        q = _apply_search_joins(q, search_joins)
-            q = q.outerjoin(join_rel)
 
         if filters:
             q = q.where(and_(*filters))
@@ -990,10 +968,10 @@ class AsyncCrud(Generic[ModelType]):
         if cursor is not None and items_page:
             prev_cursor = _encode_cursor(getattr(items_page[0], cursor_col_name))
 
-        items: list[Any] = (
+        items: list[Any] = [schema.model_validate(item) for item in items_page]
-            [schema.model_validate(item) for item in items_page]
+
-            if schema
+        filter_attributes = await cls._build_filter_attributes(
-            else items_page
+            session, facet_fields, filters, search_joins
         )
 
         return PaginatedResponse(
@@ -1004,6 +982,7 @@ class AsyncCrud(Generic[ModelType]):
                 items_per_page=items_per_page,
                 has_more=has_more,
             ),
+            filter_attributes=filter_attributes,
         )
 
 
@@ -1011,6 +990,8 @@ def CrudFactory(
     model: type[ModelType],
     *,
     searchable_fields: Sequence[SearchFieldType] | None = None,
+    facet_fields: Sequence[FacetFieldType] | None = None,
+    order_fields: Sequence[QueryableAttribute[Any]] | None = None,
     m2m_fields: M2MFieldType | None = None,
     default_load_options: list[ExecutableOption] | None = None,
     cursor_column: Any | None = None,
@@ -1020,6 +1001,11 @@ def CrudFactory(
     Args:
         model: SQLAlchemy model class
         searchable_fields: Optional list of searchable fields
+        facet_fields: Optional list of columns to compute distinct values for in paginated
+            responses. Supports direct columns (``User.status``) and relationship tuples
+            (``(User.role, Role.name)``). Can be overridden per call.
+        order_fields: Optional list of model attributes that callers are allowed to order by
+            via ``order_params()``. Can be overridden per call.
         m2m_fields: Optional mapping for many-to-many relationships.
             Maps schema field names (containing lists of IDs) to
             SQLAlchemy relationship attributes.
@@ -1056,6 +1042,12 @@ def CrudFactory(
             m2m_fields={"tag_ids": Post.tags},
         )
 
+        # With facet fields for filter dropdowns / faceted search:
+        UserCrud = CrudFactory(
+            User,
+            facet_fields=[User.status, User.country, (User.role, Role.name)],
+        )
+
         # With a fixed cursor column for cursor_paginate:
         PostCrud = CrudFactory(
             Post,
@@ -1106,6 +1098,8 @@ def CrudFactory(
         {
             "model": model,
             "searchable_fields": searchable_fields,
+            "facet_fields": facet_fields,
+            "order_fields": order_fields,
             "m2m_fields": m2m_fields,
             "default_load_options": default_load_options,
             "cursor_column": cursor_column,

src/fastapi_toolsets/crud/search.py

@@ -1,20 +1,23 @@
 """Search utilities for AsyncCrud."""
 
+import asyncio
+import functools
+from collections import Counter
 from collections.abc import Sequence
-from dataclasses import dataclass
+from dataclasses import dataclass, replace
 from typing import TYPE_CHECKING, Any, Literal
 
-from sqlalchemy import String, or_
+from sqlalchemy import String, and_, or_, select
+from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 from sqlalchemy.orm.attributes import InstrumentedAttribute
 
-from ..exceptions import NoSearchableFieldsError
+from ..exceptions import InvalidFacetFilterError, NoSearchableFieldsError
+from ..types import FacetFieldType, SearchFieldType
 
 if TYPE_CHECKING:
     from sqlalchemy.sql.elements import ColumnElement
 
-SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
-
 
 @dataclass
 class SearchConfig:
@@ -33,6 +36,7 @@ class SearchConfig:
     match_mode: Literal["any", "all"] = "any"
 
 
+@functools.lru_cache(maxsize=128)
 def get_searchable_fields(
     model: type[DeclarativeBase],
     *,
@@ -89,19 +93,19 @@ def build_search_filters(
 
     Returns:
         Tuple of (filter_conditions, joins_needed)
+
+    Raises:
+        NoSearchableFieldsError: If no searchable field has been configured
     """
     # Normalize input
     if isinstance(search, str):
         config = SearchConfig(query=search, fields=search_fields)
     else:
-        config = search
+        config = (
-        if search_fields is not None:
+            replace(search, fields=search_fields)
-            config = SearchConfig(
+            if search_fields is not None
-                query=config.query,
+            else search
-                fields=search_fields,
+        )
-                case_sensitive=config.case_sensitive,
-                match_mode=config.match_mode,
-            )
 
     if not config.query or not config.query.strip():
         return [], []
@@ -136,7 +140,7 @@ def build_search_filters(
         else:
             filters.append(column_as_string.ilike(f"%{query}%"))
 
-    if not filters:
+    if not filters:  # pragma: no cover
         return [], []
 
     # Combine based on match_mode
@@ -144,3 +148,143 @@ def build_search_filters(
         return [or_(*filters)], joins
     else:
         return filters, joins
+
+
+def facet_keys(facet_fields: Sequence[FacetFieldType]) -> list[str]:
+    """Return a key for each facet field, disambiguating duplicate column keys.
+
+    Args:
+        facet_fields: Sequence of facet fields — either direct columns or
+            relationship tuples ``(rel, ..., column)``.
+
+    Returns:
+        A list of string keys, one per facet field, in the same order.
+    """
+    raw: list[tuple[str, str | None]] = []
+    for field in facet_fields:
+        if isinstance(field, tuple):
+            rel = field[-2]
+            column = field[-1]
+            raw.append((column.key, rel.key))
+        else:
+            raw.append((field.key, None))
+
+    counts = Counter(col_key for col_key, _ in raw)
+    keys: list[str] = []
+    for col_key, rel_key in raw:
+        if counts[col_key] > 1 and rel_key is not None:
+            keys.append(f"{rel_key}__{col_key}")
+        else:
+            keys.append(col_key)
+    return keys
+
+
+async def build_facets(
+    session: "AsyncSession",
+    model: type[DeclarativeBase],
+    facet_fields: Sequence[FacetFieldType],
+    *,
+    base_filters: "list[ColumnElement[bool]] | None" = None,
+    base_joins: list[InstrumentedAttribute[Any]] | None = None,
+) -> dict[str, list[Any]]:
+    """Return distinct values for each facet field, respecting current filters.
+
+    Args:
+        session: DB async session
+        model: SQLAlchemy model class
+        facet_fields: Columns or relationship tuples to facet on
+        base_filters: Filter conditions already applied to the main query (search + caller filters)
+        base_joins: Relationship joins already applied to the main query
+
+    Returns:
+        Dict mapping column key to sorted list of distinct non-None values
+    """
+    existing_join_keys: set[str] = {str(j) for j in (base_joins or [])}
+
+    keys = facet_keys(facet_fields)
+
+    async def _query_facet(field: FacetFieldType, key: str) -> tuple[str, list[Any]]:
+        if isinstance(field, tuple):
+            # Relationship chain: (User.role, Role.name) — last element is the column
+            rels = field[:-1]
+            column = field[-1]
+        else:
+            rels = ()
+            column = field
+
+        q = select(column).select_from(model).distinct()
+
+        # Apply base joins (already done on main query, but needed here independently)
+        for rel in base_joins or []:
+            q = q.outerjoin(rel)
+
+        # Add any extra joins required by this facet field that aren't already in base_joins
+        for rel in rels:
+            if str(rel) not in existing_join_keys:
+                q = q.outerjoin(rel)
+
+        if base_filters:
+            q = q.where(and_(*base_filters))
+
+        q = q.order_by(column)
+        result = await session.execute(q)
+        values = [row[0] for row in result.all() if row[0] is not None]
+        return key, values
+
+    pairs = await asyncio.gather(
+        *[_query_facet(f, k) for f, k in zip(facet_fields, keys)]
+    )
+    return dict(pairs)
+
+
+def build_filter_by(
+    filter_by: dict[str, Any],
+    facet_fields: Sequence[FacetFieldType],
+) -> tuple["list[ColumnElement[bool]]", list[InstrumentedAttribute[Any]]]:
+    """Translate a {column_key: value} dict into SQLAlchemy filter conditions.
+
+    Args:
+        filter_by: Mapping of column key to scalar value or list of values
+        facet_fields: Declared facet fields to validate keys against
+
+    Returns:
+        Tuple of (filter_conditions, joins_needed)
+
+    Raises:
+        InvalidFacetFilterError: If a key in filter_by is not a declared facet field
+    """
+    index: dict[
+        str, tuple[InstrumentedAttribute[Any], list[InstrumentedAttribute[Any]]]
+    ] = {}
+    for key, field in zip(facet_keys(facet_fields), facet_fields):
+        if isinstance(field, tuple):
+            rels = list(field[:-1])
+            column = field[-1]
+        else:
+            rels = []
+            column = field
+        index[key] = (column, rels)
+
+    valid_keys = set(index)
+    filters: list[ColumnElement[bool]] = []
+    joins: list[InstrumentedAttribute[Any]] = []
+    added_join_keys: set[str] = set()
+
+    for key, value in filter_by.items():
+        if key not in index:
+            raise InvalidFacetFilterError(key, valid_keys)
+
+        column, rels = index[key]
+
+        for rel in rels:
+            rel_key = str(rel)
+            if rel_key not in added_join_keys:
+                joins.append(rel)
+                added_join_keys.add(rel_key)
+
+        if isinstance(value, list):
+            filters.append(column.in_(value))
+        else:
+            filters.append(column == value)
+
+    return filters, joins

src/fastapi_toolsets/dependencies.py

@@ -1,20 +1,17 @@
 """Dependency factories for FastAPI routes."""
 
 import inspect
-from collections.abc import AsyncGenerator, Callable
+from collections.abc import Callable
-from typing import Any, TypeVar, cast
+from typing import Any, cast
 
 from fastapi import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import DeclarativeBase
 
 from .crud import CrudFactory
+from .types import ModelType, SessionDependency
 
 __all__ = ["BodyDependency", "PathDependency"]
 
-ModelType = TypeVar("ModelType", bound=DeclarativeBase)
-SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]
-
 
 def PathDependency(
     model: type[ModelType],

src/fastapi_toolsets/exceptions/__init__.py

@@ -5,6 +5,8 @@ from .exceptions import (
     ApiException,
     ConflictError,
     ForbiddenError,
+    InvalidFacetFilterError,
+    InvalidOrderFieldError,
     NoSearchableFieldsError,
     NotFoundError,
     UnauthorizedError,
@@ -19,6 +21,8 @@ __all__ = [
     "ForbiddenError",
     "generate_error_responses",
     "init_exceptions_handlers",
+    "InvalidFacetFilterError",
+    "InvalidOrderFieldError",
     "NoSearchableFieldsError",
     "NotFoundError",
     "UnauthorizedError",

src/fastapi_toolsets/exceptions/exceptions.py

@@ -102,6 +102,57 @@ class NoSearchableFieldsError(ApiException):
         super().__init__(detail)
 
 
+class InvalidFacetFilterError(ApiException):
+    """Raised when filter_by contains a key not declared in facet_fields."""
+
+    api_error = ApiError(
+        code=400,
+        msg="Invalid Facet Filter",
+        desc="One or more filter_by keys are not declared as facet fields.",
+        err_code="FACET-400",
+    )
+
+    def __init__(self, key: str, valid_keys: set[str]) -> None:
+        """Initialize the exception.
+
+        Args:
+            key: The unknown filter key provided by the caller
+            valid_keys: Set of valid keys derived from the declared facet_fields
+        """
+        self.key = key
+        self.valid_keys = valid_keys
+        detail = (
+            f"'{key}' is not a declared facet field. "
+            f"Valid keys: {sorted(valid_keys) or 'none — set facet_fields on the CRUD class'}."
+        )
+        super().__init__(detail)
+
+
+class InvalidOrderFieldError(ApiException):
+    """Raised when order_by contains a field not in the allowed order fields."""
+
+    api_error = ApiError(
+        code=422,
+        msg="Invalid Order Field",
+        desc="The requested order field is not allowed for this resource.",
+        err_code="SORT-422",
+    )
+
+    def __init__(self, field: str, valid_fields: list[str]) -> None:
+        """Initialize the exception.
+
+        Args:
+            field: The unknown order field provided by the caller
+            valid_fields: List of valid field names
+        """
+        self.field = field
+        self.valid_fields = valid_fields
+        detail = (
+            f"'{field}' is not an allowed order field. Valid fields: {valid_fields}."
+        )
+        super().__init__(detail)
+
+
 def generate_error_responses(
     *errors: type[ApiException],
 ) -> dict[int | str, dict[str, Any]]:

src/fastapi_toolsets/exceptions/handler.py

@@ -10,6 +10,10 @@ from fastapi.responses import JSONResponse
 from ..schemas import ErrorResponse, ResponseStatus
 from .exceptions import ApiException
 
+_VALIDATION_LOCATION_PARAMS: frozenset[str] = frozenset(
+    {"body", "query", "path", "header", "cookie"}
+)
+
 
 def init_exceptions_handlers(app: FastAPI) -> FastAPI:
     """Register exception handlers and custom OpenAPI schema on a FastAPI app.
@@ -106,9 +110,7 @@ def _format_validation_error(
 
     for error in errors:
         field_path = ".".join(
-            str(loc)
+            str(loc) for loc in error["loc"] if loc not in _VALIDATION_LOCATION_PARAMS
-            for loc in error["loc"]
-            if loc not in ("body", "query", "path", "header", "cookie")
         )
         formatted_errors.append(
             {

src/fastapi_toolsets/fixtures/utils.py

@@ -1,24 +1,84 @@
 """Fixture loading utilities for database seeding."""
 
 from collections.abc import Callable, Sequence
-from typing import Any, TypeVar
+from typing import Any
 
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 
 from ..db import get_transaction
 from ..logger import get_logger
+from ..types import ModelType
 from .enum import LoadStrategy
 from .registry import Context, FixtureRegistry
 
 logger = get_logger()
 
-T = TypeVar("T", bound=DeclarativeBase)
+
+async def _load_ordered(
+    session: AsyncSession,
+    registry: FixtureRegistry,
+    ordered_names: list[str],
+    strategy: LoadStrategy,
+) -> dict[str, list[DeclarativeBase]]:
+    """Load fixtures in order."""
+    results: dict[str, list[DeclarativeBase]] = {}
+
+    for name in ordered_names:
+        fixture = registry.get(name)
+        instances = list(fixture.func())
+
+        if not instances:
+            results[name] = []
+            continue
+
+        model_name = type(instances[0]).__name__
+        loaded: list[DeclarativeBase] = []
+
+        async with get_transaction(session):
+            for instance in instances:
+                if strategy == LoadStrategy.INSERT:
+                    session.add(instance)
+                    loaded.append(instance)
+
+                elif strategy == LoadStrategy.MERGE:
+                    merged = await session.merge(instance)
+                    loaded.append(merged)
+
+                else:  # LoadStrategy.SKIP_EXISTING
+                    pk = _get_primary_key(instance)
+                    if pk is not None:
+                        existing = await session.get(type(instance), pk)
+                        if existing is None:
+                            session.add(instance)
+                            loaded.append(instance)
+                    else:
+                        session.add(instance)
+                        loaded.append(instance)
+
+        results[name] = loaded
+        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
+
+    return results
+
+
+def _get_primary_key(instance: DeclarativeBase) -> Any | None:
+    """Get the primary key value of a model instance."""
+    mapper = instance.__class__.__mapper__
+    pk_cols = mapper.primary_key
+
+    if len(pk_cols) == 1:
+        return getattr(instance, pk_cols[0].name, None)
+
+    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
+    if all(v is not None for v in pk_values):
+        return pk_values
+    return None
 
 
 def get_obj_by_attr(
-    fixtures: Callable[[], Sequence[T]], attr_name: str, value: Any
+    fixtures: Callable[[], Sequence[ModelType]], attr_name: str, value: Any
-) -> T:
+) -> ModelType:
     """Get a SQLAlchemy model instance by matching an attribute value.
 
     Args:
@@ -57,13 +117,6 @@ async def load_fixtures(
 
     Returns:
         Dict mapping fixture names to loaded instances
-
-    Example:
-        ```python
-        # Loads 'roles' first (dependency), then 'users'
-        result = await load_fixtures(session, fixtures, "users")
-        print(result["users"])  # [User(...), ...]
-        ```
     """
     ordered = registry.resolve_dependencies(*names)
     return await _load_ordered(session, registry, ordered, strategy)
@@ -85,76 +138,6 @@ async def load_fixtures_by_context(
 
     Returns:
         Dict mapping fixture names to loaded instances
-
-    Example:
-        ```python
-        # Load base + testing fixtures
-        await load_fixtures_by_context(
-            session, fixtures,
-            Context.BASE, Context.TESTING
-        )
-        ```
     """
     ordered = registry.resolve_context_dependencies(*contexts)
     return await _load_ordered(session, registry, ordered, strategy)
-
-
-async def _load_ordered(
-    session: AsyncSession,
-    registry: FixtureRegistry,
-    ordered_names: list[str],
-    strategy: LoadStrategy,
-) -> dict[str, list[DeclarativeBase]]:
-    """Load fixtures in order."""
-    results: dict[str, list[DeclarativeBase]] = {}
-
-    for name in ordered_names:
-        fixture = registry.get(name)
-        instances = list(fixture.func())
-
-        if not instances:
-            results[name] = []
-            continue
-
-        model_name = type(instances[0]).__name__
-        loaded: list[DeclarativeBase] = []
-
-        async with get_transaction(session):
-            for instance in instances:
-                if strategy == LoadStrategy.INSERT:
-                    session.add(instance)
-                    loaded.append(instance)
-
-                elif strategy == LoadStrategy.MERGE:
-                    merged = await session.merge(instance)
-                    loaded.append(merged)
-
-                elif strategy == LoadStrategy.SKIP_EXISTING:
-                    pk = _get_primary_key(instance)
-                    if pk is not None:
-                        existing = await session.get(type(instance), pk)
-                        if existing is None:
-                            session.add(instance)
-                            loaded.append(instance)
-                    else:
-                        session.add(instance)
-                        loaded.append(instance)
-
-        results[name] = loaded
-        logger.info(f"Loaded fixture '{name}': {len(loaded)} {model_name}(s)")
-
-    return results
-
-
-def _get_primary_key(instance: DeclarativeBase) -> Any | None:
-    """Get the primary key value of a model instance."""
-    mapper = instance.__class__.__mapper__
-    pk_cols = mapper.primary_key
-
-    if len(pk_cols) == 1:
-        return getattr(instance, pk_cols[0].name, None)
-
-    pk_values = tuple(getattr(instance, col.name, None) for col in pk_cols)
-    if all(v is not None for v in pk_values):
-        return pk_values
-    return None

src/fastapi_toolsets/metrics/handler.py

@@ -53,17 +53,23 @@ def init_metrics(
         logger.debug("Initialising metric provider '%s'", provider.name)
         provider.func()
 
-    collectors = registry.get_collectors()
+    # Partition collectors and cache env check at startup — both are stable for the app lifetime.
+    async_collectors = [
+        c for c in registry.get_collectors() if asyncio.iscoroutinefunction(c.func)
+    ]
+    sync_collectors = [
+        c for c in registry.get_collectors() if not asyncio.iscoroutinefunction(c.func)
+    ]
+    multiprocess_mode = _is_multiprocess()
 
     @app.get(path, include_in_schema=False)
     async def metrics_endpoint() -> Response:
-        for collector in collectors:
+        for collector in sync_collectors:
-            if asyncio.iscoroutinefunction(collector.func):
+            collector.func()
-                await collector.func()
+        for collector in async_collectors:
-            else:
+            await collector.func()
-                collector.func()
 
-        if _is_multiprocess():
+        if multiprocess_mode:
             prom_registry = CollectorRegistry()
             multiprocess.MultiProcessCollector(prom_registry)
             output = generate_latest(prom_registry)

src/fastapi_toolsets/schemas.py

@@ -1,24 +1,23 @@
 """Base Pydantic schemas for API responses."""
 
 from enum import Enum
-from typing import Any, ClassVar, Generic, TypeVar
+from typing import Any, ClassVar, Generic
 
 from pydantic import BaseModel, ConfigDict
 
+from .types import DataT
+
 __all__ = [
     "ApiError",
     "CursorPagination",
     "ErrorResponse",
     "OffsetPagination",
-    "Pagination",
     "PaginatedResponse",
     "PydanticBase",
     "Response",
     "ResponseStatus",
 ]
 
-DataT = TypeVar("DataT")
-
 
 class PydanticBase(BaseModel):
     """Base class for all Pydantic models with common configuration."""
@@ -108,10 +107,6 @@ class OffsetPagination(PydanticBase):
     has_more: bool
 
 
-# Backward-compatible - will be removed in v2.0
-Pagination = OffsetPagination
-
-
 class CursorPagination(PydanticBase):
     """Pagination metadata for cursor-based list responses.
 
@@ -133,3 +128,4 @@ class PaginatedResponse(BaseResponse, Generic[DataT]):
 
     data: list[DataT]
     pagination: OffsetPagination | CursorPagination
+    filter_attributes: dict[str, list[Any]] | None = None

src/fastapi_toolsets/types.py

@@ -0,0 +1,27 @@
+"""Shared type aliases for the fastapi-toolsets package."""
+
+from collections.abc import AsyncGenerator, Callable, Mapping
+from typing import Any, TypeVar
+
+from pydantic import BaseModel
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import DeclarativeBase, QueryableAttribute
+from sqlalchemy.orm.attributes import InstrumentedAttribute
+from sqlalchemy.sql.elements import ColumnElement
+
+# Generic TypeVars
+DataT = TypeVar("DataT")
+ModelType = TypeVar("ModelType", bound=DeclarativeBase)
+SchemaType = TypeVar("SchemaType", bound=BaseModel)
+
+# CRUD type aliases
+JoinType = list[tuple[type[DeclarativeBase], Any]]
+M2MFieldType = Mapping[str, QueryableAttribute[Any]]
+OrderByClause = ColumnElement[Any] | QueryableAttribute[Any]
+
+# Search / facet type aliases
+SearchFieldType = InstrumentedAttribute[Any] | tuple[InstrumentedAttribute[Any], ...]
+FacetFieldType = SearchFieldType
+
+# Dependency type aliases
+SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]

tests/conftest.py

@@ -92,6 +92,15 @@ class IntRole(Base):
     name: Mapped[str] = mapped_column(String(50), unique=True)
 
 
+class Permission(Base):
+    """Test model with composite primary key."""
+
+    __tablename__ = "permissions"
+
+    subject: Mapped[str] = mapped_column(String(50), primary_key=True)
+    action: Mapped[str] = mapped_column(String(50), primary_key=True)
+
+
 class Event(Base):
     """Test model with DateTime and Date cursor columns."""
 
@@ -162,6 +171,7 @@ class UserRead(PydanticBase):
 
     id: uuid.UUID
     username: str
+    is_active: bool = True
 
 
 class UserUpdate(BaseModel):
@@ -218,12 +228,26 @@ class PostM2MUpdate(BaseModel):
     tag_ids: list[uuid.UUID] | None = None
 
 
+class IntRoleRead(PydanticBase):
+    """Schema for reading an IntRole."""
+
+    id: int
+    name: str
+
+
 class IntRoleCreate(BaseModel):
     """Schema for creating an IntRole."""
 
     name: str
 
 
+class EventRead(PydanticBase):
+    """Schema for reading an Event."""
+
+    id: uuid.UUID
+    name: str
+
+
 class EventCreate(BaseModel):
     """Schema for creating an Event."""
 
@@ -232,6 +256,13 @@ class EventCreate(BaseModel):
     scheduled_date: datetime.date
 
 
+class ProductRead(PydanticBase):
+    """Schema for reading a Product."""
+
+    id: uuid.UUID
+    name: str
+
+
 class ProductCreate(BaseModel):
     """Schema for creating a Product."""
 

tests/test_crud.py

@@ -15,8 +15,10 @@ from .conftest import (
     EventCrud,
     EventDateCursorCrud,
     EventDateTimeCursorCrud,
+    EventRead,
     IntRoleCreate,
     IntRoleCursorCrud,
+    IntRoleRead,
     Post,
     PostCreate,
     PostCrud,
@@ -26,6 +28,7 @@ from .conftest import (
     ProductCreate,
     ProductCrud,
     ProductNumericCursorCrud,
+    ProductRead,
     Role,
     RoleCreate,
     RoleCrud,
@@ -169,7 +172,14 @@ class TestDefaultLoadOptionsIntegration:
     async def test_default_load_options_applied_to_paginate(
         self, db_session: AsyncSession
     ):
-        """default_load_options loads relationships automatically on paginate()."""
+        """default_load_options loads relationships automatically on offset_paginate()."""
+        from fastapi_toolsets.schemas import PydanticBase
+
+        class UserWithRoleRead(PydanticBase):
+            id: uuid.UUID
+            username: str
+            role: RoleRead | None = None
+
         UserWithDefaultLoad = CrudFactory(
             User, default_load_options=[selectinload(User.role)]
         )
@@ -178,7 +188,9 @@ class TestDefaultLoadOptionsIntegration:
             db_session,
             UserCreate(username="alice", email="alice@test.com", role_id=role.id),
         )
-        result = await UserWithDefaultLoad.paginate(db_session)
+        result = await UserWithDefaultLoad.offset_paginate(
+            db_session, schema=UserWithRoleRead
+        )
         assert result.data[0].role is not None
         assert result.data[0].role.name == "admin"
 
@@ -430,7 +442,7 @@ class TestCrudDelete:
         role = await RoleCrud.create(db_session, RoleCreate(name="to_delete"))
         result = await RoleCrud.delete(db_session, [Role.id == role.id])
 
-        assert result is True
+        assert result is None
         assert await RoleCrud.first(db_session, [Role.id == role.id]) is None
 
     @pytest.mark.anyio
@@ -454,6 +466,20 @@ class TestCrudDelete:
         assert len(remaining) == 1
         assert remaining[0].username == "u3"
 
+    @pytest.mark.anyio
+    async def test_delete_return_response(self, db_session: AsyncSession):
+        """Delete with return_response=True returns Response[None]."""
+        from fastapi_toolsets.schemas import Response
+
+        role = await RoleCrud.create(db_session, RoleCreate(name="to_delete_resp"))
+        result = await RoleCrud.delete(
+            db_session, [Role.id == role.id], return_response=True
+        )
+
+        assert isinstance(result, Response)
+        assert result.data is None
+        assert await RoleCrud.first(db_session, [Role.id == role.id]) is None
+
 
 class TestCrudExists:
     """Tests for CRUD exists operations."""
@@ -594,7 +620,9 @@ class TestCrudPaginate:
 
         from fastapi_toolsets.schemas import OffsetPagination
 
-        result = await RoleCrud.paginate(db_session, page=1, items_per_page=10)
+        result = await RoleCrud.offset_paginate(
+            db_session, page=1, items_per_page=10, schema=RoleRead
+        )
 
         assert isinstance(result.pagination, OffsetPagination)
         assert len(result.data) == 10
@@ -609,7 +637,9 @@ class TestCrudPaginate:
         for i in range(25):
             await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
 
-        result = await RoleCrud.paginate(db_session, page=3, items_per_page=10)
+        result = await RoleCrud.offset_paginate(
+            db_session, page=3, items_per_page=10, schema=RoleRead
+        )
 
         assert len(result.data) == 5
         assert result.pagination.has_more is False
@@ -629,11 +659,12 @@ class TestCrudPaginate:
 
         from fastapi_toolsets.schemas import OffsetPagination
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             filters=[User.is_active == True],  # noqa: E712
             page=1,
             items_per_page=10,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -646,11 +677,12 @@ class TestCrudPaginate:
         await RoleCrud.create(db_session, RoleCreate(name="alpha"))
         await RoleCrud.create(db_session, RoleCreate(name="bravo"))
 
-        result = await RoleCrud.paginate(
+        result = await RoleCrud.offset_paginate(
             db_session,
             order_by=Role.name,
             page=1,
             items_per_page=10,
+            schema=RoleRead,
         )
 
         names = [r.name for r in result.data]
@@ -855,12 +887,13 @@ class TestCrudJoins:
         from fastapi_toolsets.schemas import OffsetPagination
 
         # Paginate users with published posts
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             joins=[(Post, Post.author_id == User.id)],
             filters=[Post.is_published == True],  # noqa: E712
             page=1,
             items_per_page=10,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -889,12 +922,13 @@ class TestCrudJoins:
         from fastapi_toolsets.schemas import OffsetPagination
 
         # Paginate with outer join
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             joins=[(Post, Post.author_id == User.id)],
             outer_join=True,
             page=1,
             items_per_page=10,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -931,70 +965,6 @@ class TestCrudJoins:
         assert users[0].username == "multi_join"
 
 
-class TestAsResponse:
-    """Tests for as_response parameter (deprecated, kept for backward compat)."""
-
-    @pytest.mark.anyio
-    async def test_create_as_response(self, db_session: AsyncSession):
-        """Create with as_response=True returns Response and emits DeprecationWarning."""
-        from fastapi_toolsets.schemas import Response
-
-        data = RoleCreate(name="response_role")
-        with pytest.warns(DeprecationWarning, match="as_response is deprecated"):
-            result = await RoleCrud.create(db_session, data, as_response=True)
-
-        assert isinstance(result, Response)
-        assert result.data is not None
-        assert result.data.name == "response_role"
-
-    @pytest.mark.anyio
-    async def test_get_as_response(self, db_session: AsyncSession):
-        """Get with as_response=True returns Response and emits DeprecationWarning."""
-        from fastapi_toolsets.schemas import Response
-
-        created = await RoleCrud.create(db_session, RoleCreate(name="get_response"))
-        with pytest.warns(DeprecationWarning, match="as_response is deprecated"):
-            result = await RoleCrud.get(
-                db_session, [Role.id == created.id], as_response=True
-            )
-
-        assert isinstance(result, Response)
-        assert result.data is not None
-        assert result.data.id == created.id
-
-    @pytest.mark.anyio
-    async def test_update_as_response(self, db_session: AsyncSession):
-        """Update with as_response=True returns Response and emits DeprecationWarning."""
-        from fastapi_toolsets.schemas import Response
-
-        created = await RoleCrud.create(db_session, RoleCreate(name="old_name"))
-        with pytest.warns(DeprecationWarning, match="as_response is deprecated"):
-            result = await RoleCrud.update(
-                db_session,
-                RoleUpdate(name="new_name"),
-                [Role.id == created.id],
-                as_response=True,
-            )
-
-        assert isinstance(result, Response)
-        assert result.data is not None
-        assert result.data.name == "new_name"
-
-    @pytest.mark.anyio
-    async def test_delete_as_response(self, db_session: AsyncSession):
-        """Delete with as_response=True returns Response and emits DeprecationWarning."""
-        from fastapi_toolsets.schemas import Response
-
-        created = await RoleCrud.create(db_session, RoleCreate(name="to_delete"))
-        with pytest.warns(DeprecationWarning, match="as_response is deprecated"):
-            result = await RoleCrud.delete(
-                db_session, [Role.id == created.id], as_response=True
-            )
-
-        assert isinstance(result, Response)
-        assert result.data is None
-
-
 class TestCrudFactoryM2M:
     """Tests for CrudFactory with m2m_fields parameter."""
 
@@ -1475,92 +1445,35 @@ class TestSchemaResponse:
         assert isinstance(result, Response)
 
     @pytest.mark.anyio
-    async def test_paginate_with_schema(self, db_session: AsyncSession):
+    async def test_offset_paginate_with_schema(self, db_session: AsyncSession):
-        """paginate with schema returns PaginatedResponse[SchemaType]."""
+        """offset_paginate with schema returns PaginatedResponse[SchemaType]."""
         from fastapi_toolsets.schemas import PaginatedResponse
 
         await RoleCrud.create(db_session, RoleCreate(name="p_role1"))
         await RoleCrud.create(db_session, RoleCreate(name="p_role2"))
 
-        result = await RoleCrud.paginate(db_session, schema=RoleRead)
+        result = await RoleCrud.offset_paginate(db_session, schema=RoleRead)
 
         assert isinstance(result, PaginatedResponse)
         assert len(result.data) == 2
         assert all(isinstance(item, RoleRead) for item in result.data)
 
     @pytest.mark.anyio
-    async def test_paginate_schema_filters_fields(self, db_session: AsyncSession):
+    async def test_offset_paginate_schema_filters_fields(
-        """paginate with schema only exposes schema fields per item."""
+        self, db_session: AsyncSession
+    ):
+        """offset_paginate with schema only exposes schema fields per item."""
         await UserCrud.create(
             db_session,
             UserCreate(username="pg_user", email="pg@test.com"),
         )
 
-        result = await UserCrud.paginate(db_session, schema=UserRead)
+        result = await UserCrud.offset_paginate(db_session, schema=UserRead)
 
         assert isinstance(result.data[0], UserRead)
         assert result.data[0].username == "pg_user"
         assert not hasattr(result.data[0], "email")
 
-    @pytest.mark.anyio
-    async def test_as_response_true_without_schema_unchanged(
-        self, db_session: AsyncSession
-    ):
-        """as_response=True without schema still returns Response[ModelType] with a warning."""
-        from fastapi_toolsets.schemas import Response
-
-        created = await RoleCrud.create(db_session, RoleCreate(name="compat"))
-        with pytest.warns(DeprecationWarning, match="as_response is deprecated"):
-            result = await RoleCrud.get(
-                db_session, [Role.id == created.id], as_response=True
-            )
-
-        assert isinstance(result, Response)
-        assert isinstance(result.data, Role)
-
-    @pytest.mark.anyio
-    async def test_schema_with_explicit_as_response_true(
-        self, db_session: AsyncSession
-    ):
-        """schema combined with explicit as_response=True works correctly."""
-        from fastapi_toolsets.schemas import Response
-
-        created = await RoleCrud.create(db_session, RoleCreate(name="combined"))
-        result = await RoleCrud.get(
-            db_session,
-            [Role.id == created.id],
-            as_response=True,
-            schema=RoleRead,
-        )
-
-        assert isinstance(result, Response)
-        assert isinstance(result.data, RoleRead)
-
-
-class TestPaginateAlias:
-    """Tests that paginate is a backward-compatible alias for offset_paginate."""
-
-    def test_paginate_is_alias_of_offset_paginate(self):
-        """paginate and offset_paginate are the same underlying function."""
-        assert RoleCrud.paginate.__func__ is RoleCrud.offset_paginate.__func__
-
-    @pytest.mark.anyio
-    async def test_paginate_alias_returns_offset_pagination(
-        self, db_session: AsyncSession
-    ):
-        """paginate() still works and returns PaginatedResponse with OffsetPagination."""
-        from fastapi_toolsets.schemas import OffsetPagination, PaginatedResponse
-
-        for i in range(3):
-            await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
-
-        result = await RoleCrud.paginate(db_session, page=1, items_per_page=10)
-
-        assert isinstance(result, PaginatedResponse)
-        assert isinstance(result.pagination, OffsetPagination)
-        assert result.pagination.total_count == 3
-        assert result.pagination.page == 1
-
 
 class TestCursorPaginate:
     """Tests for cursor-based pagination via cursor_paginate()."""
@@ -1573,7 +1486,9 @@ class TestCursorPaginate:
         for i in range(25):
             await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
 
-        result = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=10)
+        result = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=10, schema=RoleRead
+        )
 
         assert isinstance(result, PaginatedResponse)
         assert isinstance(result.pagination, CursorPagination)
@@ -1591,7 +1506,9 @@ class TestCursorPaginate:
         for i in range(5):
             await RoleCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
 
-        result = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=10)
+        result = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=10, schema=RoleRead
+        )
 
         assert isinstance(result.pagination, CursorPagination)
         assert len(result.data) == 5
@@ -1606,14 +1523,16 @@ class TestCursorPaginate:
 
         from fastapi_toolsets.schemas import CursorPagination
 
-        page1 = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=10)
+        page1 = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=10, schema=RoleRead
+        )
         assert isinstance(page1.pagination, CursorPagination)
         assert len(page1.data) == 10
         assert page1.pagination.has_more is True
 
         cursor = page1.pagination.next_cursor
         page2 = await RoleCursorCrud.cursor_paginate(
-            db_session, cursor=cursor, items_per_page=10
+            db_session, cursor=cursor, items_per_page=10, schema=RoleRead
         )
         assert isinstance(page2.pagination, CursorPagination)
         assert len(page2.data) == 5
@@ -1628,12 +1547,15 @@ class TestCursorPaginate:
 
         from fastapi_toolsets.schemas import CursorPagination
 
-        page1 = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=4)
+        page1 = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=4, schema=RoleRead
+        )
         assert isinstance(page1.pagination, CursorPagination)
         page2 = await RoleCursorCrud.cursor_paginate(
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=4,
+            schema=RoleRead,
         )
 
         ids_page1 = {r.id for r in page1.data}
@@ -1646,7 +1568,9 @@ class TestCursorPaginate:
         """cursor_paginate on an empty table returns empty data with no cursor."""
         from fastapi_toolsets.schemas import CursorPagination
 
-        result = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=10)
+        result = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=10, schema=RoleRead
+        )
 
         assert isinstance(result.pagination, CursorPagination)
         assert result.data == []
@@ -1671,6 +1595,7 @@ class TestCursorPaginate:
             db_session,
             filters=[User.is_active == True],  # noqa: E712
             items_per_page=20,
+            schema=UserRead,
         )
 
         assert len(result.data) == 5
@@ -1703,7 +1628,9 @@ class TestCursorPaginate:
         for i in range(5):
             await RoleNameCrud.create(db_session, RoleCreate(name=f"role{i:02d}"))
 
-        result = await RoleNameCrud.cursor_paginate(db_session, items_per_page=3)
+        result = await RoleNameCrud.cursor_paginate(
+            db_session, items_per_page=3, schema=RoleRead
+        )
 
         assert isinstance(result.pagination, CursorPagination)
         assert len(result.data) == 3
@@ -1714,7 +1641,7 @@ class TestCursorPaginate:
     async def test_raises_without_cursor_column(self, db_session: AsyncSession):
         """cursor_paginate raises ValueError when cursor_column is not configured."""
         with pytest.raises(ValueError, match="cursor_column is not set"):
-            await RoleCrud.cursor_paginate(db_session)
+            await RoleCrud.cursor_paginate(db_session, schema=RoleRead)
 
 
 class TestCursorPaginatePrevCursor:
@@ -1728,7 +1655,9 @@ class TestCursorPaginatePrevCursor:
 
         from fastapi_toolsets.schemas import CursorPagination
 
-        result = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=3)
+        result = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=3, schema=RoleRead
+        )
 
         assert isinstance(result.pagination, CursorPagination)
         assert result.pagination.prev_cursor is None
@@ -1741,12 +1670,15 @@ class TestCursorPaginatePrevCursor:
 
         from fastapi_toolsets.schemas import CursorPagination
 
-        page1 = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=5)
+        page1 = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=5, schema=RoleRead
+        )
         assert isinstance(page1.pagination, CursorPagination)
         page2 = await RoleCursorCrud.cursor_paginate(
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=5,
+            schema=RoleRead,
         )
         assert isinstance(page2.pagination, CursorPagination)
         assert page2.pagination.prev_cursor is not None
@@ -1762,12 +1694,15 @@ class TestCursorPaginatePrevCursor:
 
         from fastapi_toolsets.schemas import CursorPagination
 
-        page1 = await RoleCursorCrud.cursor_paginate(db_session, items_per_page=5)
+        page1 = await RoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=5, schema=RoleRead
+        )
         assert isinstance(page1.pagination, CursorPagination)
         page2 = await RoleCursorCrud.cursor_paginate(
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=5,
+            schema=RoleRead,
         )
         assert isinstance(page2.pagination, CursorPagination)
         assert page2.pagination.prev_cursor is not None
@@ -1802,6 +1737,7 @@ class TestCursorPaginateWithSearch:
             db_session,
             search="admin",
             items_per_page=20,
+            schema=RoleRead,
         )
 
         assert len(result.data) == 5
@@ -1836,6 +1772,7 @@ class TestCursorPaginateExtraOptions:
             db_session,
             joins=[(Role, User.role_id == Role.id)],
             items_per_page=20,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, CursorPagination)
@@ -1867,6 +1804,7 @@ class TestCursorPaginateExtraOptions:
             joins=[(Role, User.role_id == Role.id)],
             outer_join=True,
             items_per_page=20,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, CursorPagination)
@@ -1876,7 +1814,12 @@ class TestCursorPaginateExtraOptions:
     @pytest.mark.anyio
     async def test_with_load_options(self, db_session: AsyncSession):
         """cursor_paginate passes load_options to the query."""
-        from fastapi_toolsets.schemas import CursorPagination
+        from fastapi_toolsets.schemas import CursorPagination, PydanticBase
+
+        class UserWithRoleRead(PydanticBase):
+            id: uuid.UUID
+            username: str
+            role: RoleRead | None = None
 
         role = await RoleCrud.create(db_session, RoleCreate(name="manager"))
         for i in range(3):
@@ -1893,6 +1836,7 @@ class TestCursorPaginateExtraOptions:
             db_session,
             load_options=[selectinload(User.role)],
             items_per_page=20,
+            schema=UserWithRoleRead,
         )
 
         assert isinstance(result.pagination, CursorPagination)
@@ -1912,6 +1856,7 @@ class TestCursorPaginateExtraOptions:
             db_session,
             order_by=Role.name.desc(),
             items_per_page=3,
+            schema=RoleRead,
         )
 
         assert isinstance(result.pagination, CursorPagination)
@@ -1925,7 +1870,9 @@ class TestCursorPaginateExtraOptions:
         for i in range(5):
             await IntRoleCursorCrud.create(db_session, IntRoleCreate(name=f"role{i}"))
 
-        page1 = await IntRoleCursorCrud.cursor_paginate(db_session, items_per_page=3)
+        page1 = await IntRoleCursorCrud.cursor_paginate(
+            db_session, items_per_page=3, schema=IntRoleRead
+        )
 
         assert isinstance(page1.pagination, CursorPagination)
         assert len(page1.data) == 3
@@ -1935,6 +1882,7 @@ class TestCursorPaginateExtraOptions:
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=3,
+            schema=IntRoleRead,
         )
 
         assert isinstance(page2.pagination, CursorPagination)
@@ -1955,7 +1903,9 @@ class TestCursorPaginateExtraOptions:
         await RoleCrud.create(db_session, RoleCreate(name="role01"))
 
         # First page succeeds (no cursor to decode)
-        page1 = await RoleNameCursorCrud.cursor_paginate(db_session, items_per_page=1)
+        page1 = await RoleNameCursorCrud.cursor_paginate(
+            db_session, items_per_page=1, schema=RoleRead
+        )
         assert page1.pagination.has_more is True
         assert isinstance(page1.pagination, CursorPagination)
 
@@ -1965,6 +1915,7 @@ class TestCursorPaginateExtraOptions:
                 db_session,
                 cursor=page1.pagination.next_cursor,
                 items_per_page=1,
+                schema=RoleRead,
             )
 
 
@@ -2003,6 +1954,7 @@ class TestCursorPaginateSearchJoins:
             search="administrator",
             search_fields=[(User.role, Role.name)],
             items_per_page=20,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, CursorPagination)
@@ -2049,7 +2001,7 @@ class TestCursorPaginateColumnTypes:
             )
 
         page1 = await EventDateTimeCursorCrud.cursor_paginate(
-            db_session, items_per_page=3
+            db_session, items_per_page=3, schema=EventRead
         )
 
         assert isinstance(page1.pagination, CursorPagination)
@@ -2060,6 +2012,7 @@ class TestCursorPaginateColumnTypes:
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=3,
+            schema=EventRead,
         )
 
         assert isinstance(page2.pagination, CursorPagination)
@@ -2087,7 +2040,9 @@ class TestCursorPaginateColumnTypes:
                 ),
             )
 
-        page1 = await EventDateCursorCrud.cursor_paginate(db_session, items_per_page=3)
+        page1 = await EventDateCursorCrud.cursor_paginate(
+            db_session, items_per_page=3, schema=EventRead
+        )
 
         assert isinstance(page1.pagination, CursorPagination)
         assert len(page1.data) == 3
@@ -2097,6 +2052,7 @@ class TestCursorPaginateColumnTypes:
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=3,
+            schema=EventRead,
         )
 
         assert isinstance(page2.pagination, CursorPagination)
@@ -2123,7 +2079,7 @@ class TestCursorPaginateColumnTypes:
             )
 
         page1 = await ProductNumericCursorCrud.cursor_paginate(
-            db_session, items_per_page=3
+            db_session, items_per_page=3, schema=ProductRead
         )
 
         assert isinstance(page1.pagination, CursorPagination)
@@ -2134,6 +2090,7 @@ class TestCursorPaginateColumnTypes:
             db_session,
             cursor=page1.pagination.next_cursor,
             items_per_page=3,
+            schema=ProductRead,
         )
 
         assert isinstance(page2.pagination, CursorPagination)

tests/test_crud_search.py

@@ -1,11 +1,19 @@
 """Tests for CRUD search functionality."""
 
+import inspect
 import uuid
 
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.sql.elements import ColumnElement, UnaryExpression
 
-from fastapi_toolsets.crud import SearchConfig, get_searchable_fields
+from fastapi_toolsets.crud import (
+    CrudFactory,
+    InvalidFacetFilterError,
+    SearchConfig,
+    get_searchable_fields,
+)
+from fastapi_toolsets.exceptions import InvalidOrderFieldError
 from fastapi_toolsets.schemas import OffsetPagination
 
 from .conftest import (
@@ -15,6 +23,7 @@ from .conftest import (
     User,
     UserCreate,
     UserCrud,
+    UserRead,
 )
 
 
@@ -34,10 +43,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="bob_smith", email="bob@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="doe",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -53,10 +63,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="company_bob", email="bob@other.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="company",
             search_fields=[User.username, User.email],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -81,10 +92,11 @@ class TestPaginateSearch:
             UserCreate(username="user1", email="u1@test.com", role_id=user_role.id),
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="admin",
             search_fields=[(User.role, Role.name)],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -100,10 +112,11 @@ class TestPaginateSearch:
         )
 
         # Search "admin" in username OR role.name
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="admin",
             search_fields=[User.username, (User.role, Role.name)],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -116,10 +129,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="JohnDoe", email="j@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="johndoe",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -133,19 +147,21 @@ class TestPaginateSearch:
         )
 
         # Should not find (case mismatch)
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="johndoe", case_sensitive=True),
             search_fields=[User.username],
+            schema=UserRead,
         )
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 0
 
         # Should find (case match)
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="JohnDoe", case_sensitive=True),
             search_fields=[User.username],
+            schema=UserRead,
         )
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
@@ -160,11 +176,13 @@ class TestPaginateSearch:
             db_session, UserCreate(username="user2", email="u2@test.com")
         )
 
-        result = await UserCrud.paginate(db_session, search="")
+        result = await UserCrud.offset_paginate(db_session, search="", schema=UserRead)
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
-        result = await UserCrud.paginate(db_session, search=None)
+        result = await UserCrud.offset_paginate(
+            db_session, search=None, schema=UserRead
+        )
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 2
 
@@ -180,11 +198,12 @@ class TestPaginateSearch:
             UserCreate(username="inactive_john", email="ij@test.com", is_active=False),
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             filters=[User.is_active == True],  # noqa: E712
             search="john",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -198,7 +217,9 @@ class TestPaginateSearch:
             db_session, UserCreate(username="findme", email="other@test.com")
         )
 
-        result = await UserCrud.paginate(db_session, search="findme")
+        result = await UserCrud.offset_paginate(
+            db_session, search="findme", schema=UserRead
+        )
 
         assert isinstance(result.pagination, OffsetPagination)
         assert result.pagination.total_count == 1
@@ -210,10 +231,11 @@ class TestPaginateSearch:
             db_session, UserCreate(username="john", email="j@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="nonexistent",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -229,12 +251,13 @@ class TestPaginateSearch:
                 UserCreate(username=f"user_{i}", email=f"user{i}@test.com"),
             )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="user_",
             search_fields=[User.username],
             page=1,
             items_per_page=5,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -256,10 +279,11 @@ class TestPaginateSearch:
         )
 
         # Search in username, not in role
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="role",
             search_fields=[User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -278,11 +302,12 @@ class TestPaginateSearch:
             db_session, UserCreate(username="bob", email="b@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="@test.com",
             search_fields=[User.email],
             order_by=User.username,
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -302,10 +327,11 @@ class TestPaginateSearch:
         )
 
         # Search by UUID (partial match)
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search="12345678",
             search_fields=[User.id, User.username],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -313,9 +339,35 @@ class TestPaginateSearch:
         assert result.data[0].id == user_id
 
 
+class TestBuildSearchFilters:
+    """Unit tests for build_search_filters."""
+
+    def test_deduplicates_relationship_join(self):
+        """Two tuple fields sharing the same relationship do not add the join twice."""
+        from fastapi_toolsets.crud.search import build_search_filters
+
+        # Both fields traverse User.role — the second must not re-add the join.
+        filters, joins = build_search_filters(
+            User,
+            "admin",
+            search_fields=[(User.role, Role.name), (User.role, Role.id)],
+        )
+
+        assert len(joins) == 1
+
+
 class TestSearchConfig:
     """Tests for SearchConfig options."""
 
+    def test_search_config_empty_query_returns_empty(self):
+        """SearchConfig with an empty/blank query returns empty filters without hitting the DB."""
+        from fastapi_toolsets.crud.search import build_search_filters
+
+        filters, joins = build_search_filters(User, SearchConfig(query="   "))
+
+        assert filters == []
+        assert joins == []
+
     @pytest.mark.anyio
     async def test_match_mode_all(self, db_session: AsyncSession):
         """match_mode='all' requires all fields to match (AND)."""
@@ -329,10 +381,11 @@ class TestSearchConfig:
         )
 
         # 'john' must be in username AND email
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="john", match_mode="all"),
             search_fields=[User.username, User.email],
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -346,9 +399,10 @@ class TestSearchConfig:
             db_session, UserCreate(username="test", email="findme@test.com")
         )
 
-        result = await UserCrud.paginate(
+        result = await UserCrud.offset_paginate(
             db_session,
             search=SearchConfig(query="findme", fields=[User.email]),
+            schema=UserRead,
         )
 
         assert isinstance(result.pagination, OffsetPagination)
@@ -432,3 +486,707 @@ class TestGetSearchableFields:
         # Role.users is a collection, should not be included
         field_strs = [str(f) for f in fields]
         assert not any("users" in f for f in field_strs)
+
+
+class TestFacetsNotSet:
+    """filter_attributes is None when no facet_fields are configured."""
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_no_facets(self, db_session: AsyncSession):
+        """filter_attributes is None when facet_fields not set on factory or call."""
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        result = await UserCrud.offset_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is None
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_no_facets(self, db_session: AsyncSession):
+        """filter_attributes is None for cursor_paginate when facet_fields not set."""
+        UserCursorCrud = CrudFactory(User, cursor_column=User.id)
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        result = await UserCursorCrud.cursor_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is None
+
+
+class TestFacetsDirectColumn:
+    """Facets on direct model columns."""
+
+    @pytest.mark.anyio
+    async def test_offset_paginate_direct_column(self, db_session: AsyncSession):
+        """Returns distinct values for a direct column via factory default."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is not None
+        # Distinct usernames, sorted
+        assert result.filter_attributes["username"] == ["alice", "bob"]
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_direct_column(self, db_session: AsyncSession):
+        """Returns distinct values for a direct column in cursor_paginate."""
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.email]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCursorCrud.cursor_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is not None
+        assert set(result.filter_attributes["email"]) == {"a@test.com", "b@test.com"}
+
+    @pytest.mark.anyio
+    async def test_multiple_facet_columns(self, db_session: AsyncSession):
+        """Returns distinct values for multiple columns."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is not None
+        assert "username" in result.filter_attributes
+        assert "email" in result.filter_attributes
+        assert set(result.filter_attributes["username"]) == {"alice", "bob"}
+
+    @pytest.mark.anyio
+    async def test_per_call_override(self, db_session: AsyncSession):
+        """Per-call facet_fields overrides the factory default."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        # Override: ask for email instead of username
+        result = await UserFacetCrud.offset_paginate(
+            db_session, facet_fields=[User.email], schema=UserRead
+        )
+
+        assert result.filter_attributes is not None
+        assert "email" in result.filter_attributes
+        assert "username" not in result.filter_attributes
+
+
+class TestFacetsRespectFilters:
+    """Facets reflect the active filter conditions."""
+
+    @pytest.mark.anyio
+    async def test_facets_respect_base_filters(self, db_session: AsyncSession):
+        """Facet values are scoped to the applied filters."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com", is_active=True)
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com", is_active=False)
+        )
+
+        # Filter to active users only — facets should only see "alice"
+        result = await UserFacetCrud.offset_paginate(
+            db_session,
+            filters=[User.is_active == True],  # noqa: E712
+            schema=UserRead,
+        )
+
+        assert result.filter_attributes is not None
+        assert result.filter_attributes["username"] == ["alice"]
+
+
+class TestFacetsRelationship:
+    """Facets on relationship columns via tuple syntax."""
+
+    @pytest.mark.anyio
+    async def test_relationship_facet(self, db_session: AsyncSession):
+        """Returns distinct values from a related model column."""
+        UserRelFacetCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="bob", email="b@test.com", role_id=editor.id),
+        )
+        # User without a role — their role.name should be excluded (None filtered out)
+        await UserCrud.create(
+            db_session, UserCreate(username="charlie", email="c@test.com")
+        )
+
+        result = await UserRelFacetCrud.offset_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is not None
+        assert set(result.filter_attributes["name"]) == {"admin", "editor"}
+
+    @pytest.mark.anyio
+    async def test_relationship_facet_none_excluded(self, db_session: AsyncSession):
+        """None values (e.g. NULL role) are excluded from facet results."""
+        UserRelFacetCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+
+        # Only user with no role
+        await UserCrud.create(
+            db_session, UserCreate(username="norole", email="n@test.com")
+        )
+
+        result = await UserRelFacetCrud.offset_paginate(db_session, schema=UserRead)
+
+        assert result.filter_attributes is not None
+        assert result.filter_attributes["name"] == []
+
+    @pytest.mark.anyio
+    async def test_relationship_facet_deduplicates_join_with_search(
+        self, db_session: AsyncSession
+    ):
+        """Facet join is not duplicated when search already added the same relationship join."""
+        # Both search and facet use (User.role, Role.name) — join should not be doubled
+        UserSearchFacetCrud = CrudFactory(
+            User,
+            searchable_fields=[(User.role, Role.name)],
+            facet_fields=[(User.role, Role.name)],
+        )
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+
+        result = await UserSearchFacetCrud.offset_paginate(
+            db_session,
+            search="admin",
+            search_fields=[(User.role, Role.name)],
+            schema=UserRead,
+        )
+
+        assert result.filter_attributes is not None
+        assert result.filter_attributes["name"] == ["admin"]
+
+
+class TestFilterBy:
+    """Tests for the filter_by parameter on offset_paginate and cursor_paginate."""
+
+    @pytest.mark.anyio
+    async def test_scalar_filter(self, db_session: AsyncSession):
+        """filter_by with a scalar value produces an equality filter."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by={"username": "alice"}, schema=UserRead
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+        # facet also scoped to the filter
+        assert result.filter_attributes == {"username": ["alice"]}
+
+    @pytest.mark.anyio
+    async def test_list_filter_produces_in_clause(self, db_session: AsyncSession):
+        """filter_by with a list value produces an IN filter."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="charlie", email="c@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by={"username": ["alice", "bob"]}, schema=UserRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 2
+        returned_names = {u.username for u in result.data}
+        assert returned_names == {"alice", "bob"}
+
+    @pytest.mark.anyio
+    async def test_relationship_filter_by(self, db_session: AsyncSession):
+        """filter_by works with relationship tuple facet fields."""
+        UserRelFacetCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="bob", email="b@test.com", role_id=editor.id),
+        )
+
+        result = await UserRelFacetCrud.offset_paginate(
+            db_session, filter_by={"name": "admin"}, schema=UserRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_filter_by_combined_with_filters(self, db_session: AsyncSession):
+        """filter_by and filters= are combined (AND logic)."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com", is_active=True)
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice2", email="a2@test.com", is_active=False),
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session,
+            filters=[User.is_active == True],  # noqa: E712
+            filter_by={"username": ["alice", "alice2"]},
+            schema=UserRead,
+        )
+
+        # Only alice passes both: is_active=True AND username IN [alice, alice2]
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_invalid_key_raises(self, db_session: AsyncSession):
+        """filter_by with an undeclared key raises InvalidFacetFilterError."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+
+        with pytest.raises(InvalidFacetFilterError) as exc_info:
+            await UserFacetCrud.offset_paginate(
+                db_session, filter_by={"nonexistent": "value"}, schema=UserRead
+            )
+
+        assert exc_info.value.key == "nonexistent"
+        assert "username" in exc_info.value.valid_keys
+
+    @pytest.mark.anyio
+    async def test_filter_by_deduplicates_relationship_join(
+        self, db_session: AsyncSession
+    ):
+        """Two filter_by keys through the same relationship do not duplicate the join."""
+        # Both (User.role, Role.name) and (User.role, Role.id) traverse User.role —
+        # the second key must not re-add the join (exercises the dedup branch in build_filter_by).
+        UserRoleFacetCrud = CrudFactory(
+            User,
+            facet_fields=[(User.role, Role.name), (User.role, Role.id)],
+        )
+
+        admin = await RoleCrud.create(db_session, RoleCreate(name="admin"))
+        editor = await RoleCrud.create(db_session, RoleCreate(name="editor"))
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="alice", email="a@test.com", role_id=admin.id),
+        )
+        await UserCrud.create(
+            db_session,
+            UserCreate(username="bob", email="b@test.com", role_id=editor.id),
+        )
+
+        result = await UserRoleFacetCrud.offset_paginate(
+            db_session,
+            filter_by={"name": "admin", "id": str(admin.id)},
+            schema=UserRead,
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_cursor_paginate_filter_by(self, db_session: AsyncSession):
+        """filter_by works with cursor_paginate."""
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.username]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCursorCrud.cursor_paginate(
+            db_session, filter_by={"username": "alice"}, schema=UserRead
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+        assert result.filter_attributes == {"username": ["alice"]}
+
+    @pytest.mark.anyio
+    async def test_basemodel_filter_by_offset_paginate(self, db_session: AsyncSession):
+        """filter_by accepts a BaseModel instance (model_dump path) in offset_paginate."""
+        from pydantic import BaseModel as PydanticBaseModel
+
+        class UserFilter(PydanticBaseModel):
+            username: str | None = None
+
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by=UserFilter(username="alice"), schema=UserRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_basemodel_filter_by_cursor_paginate(self, db_session: AsyncSession):
+        """filter_by accepts a BaseModel instance (model_dump path) in cursor_paginate."""
+        from pydantic import BaseModel as PydanticBaseModel
+
+        class UserFilter(PydanticBaseModel):
+            username: str | None = None
+
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.username]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        result = await UserFacetCursorCrud.cursor_paginate(
+            db_session, filter_by=UserFilter(username="alice"), schema=UserRead
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+
+
+class TestFilterParamsSchema:
+    """Tests for AsyncCrud.filter_params()."""
+
+    def test_generates_fields_from_facet_fields(self):
+        """Returned dependency has one keyword param per facet field."""
+        import inspect
+
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        dep = UserFacetCrud.filter_params()
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"username", "email"}
+
+    def test_relationship_facet_uses_column_key(self):
+        """Relationship tuple uses the terminal column's key."""
+        import inspect
+
+        UserRoleCrud = CrudFactory(User, facet_fields=[(User.role, Role.name)])
+        dep = UserRoleCrud.filter_params()
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"name"}
+
+    def test_raises_when_no_facet_fields(self):
+        """ValueError raised when no facet_fields are configured or provided."""
+        with pytest.raises(ValueError, match="no facet_fields"):
+            UserCrud.filter_params()
+
+    def test_facet_fields_override(self):
+        """facet_fields= parameter overrides the class-level default."""
+        import inspect
+
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        dep = UserFacetCrud.filter_params(facet_fields=[User.email])
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"email"}
+
+    @pytest.mark.anyio
+    async def test_awaiting_dep_returns_dict_with_values(self):
+        """Awaiting the dependency returns a dict with only the supplied keys."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username, User.email])
+        dep = UserFacetCrud.filter_params()
+
+        result = await dep(username=["alice"])
+        assert result == {"username": ["alice"]}
+
+    @pytest.mark.anyio
+    async def test_multi_value_list_field(self):
+        """Multiple values are accepted as a list."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        dep = UserFacetCrud.filter_params()
+
+        result = await dep(username=["alice", "bob"])
+        assert result == {"username": ["alice", "bob"]}
+
+    def test_disambiguates_duplicate_column_keys(self):
+        """Two relationship tuples sharing a terminal column key get prefixed names."""
+        from unittest.mock import MagicMock
+
+        from fastapi_toolsets.crud.search import facet_keys
+
+        col_a = MagicMock()
+        col_a.key = "name"
+        rel_a = MagicMock()
+        rel_a.key = "project"
+
+        col_b = MagicMock()
+        col_b.key = "name"
+        rel_b = MagicMock()
+        rel_b.key = "os"
+
+        keys = facet_keys([(rel_a, col_a), (rel_b, col_b)])
+        assert keys == ["project__name", "os__name"]
+
+    def test_unique_column_keys_kept_plain(self):
+        """Fields with unique column keys are not prefixed."""
+        from fastapi_toolsets.crud.search import facet_keys
+
+        keys = facet_keys([User.username, User.email])
+        assert keys == ["username", "email"]
+
+    def test_dependency_name_includes_model_name(self):
+        """Returned dependency is named {Model}FilterParams."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        dep = UserFacetCrud.filter_params()
+
+        assert dep.__name__ == "UserFilterParams"  # type: ignore[union-attr]
+
+    @pytest.mark.anyio
+    async def test_integration_with_offset_paginate(self, db_session: AsyncSession):
+        """Dependency result can be passed directly to offset_paginate via filter_by."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        dep = UserFacetCrud.filter_params()
+        f = await dep(username=["alice"])
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by=f, schema=UserRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_dep_result_passed_to_cursor_paginate(self, db_session: AsyncSession):
+        """Dependency result can be passed directly to cursor_paginate via filter_by."""
+        UserFacetCursorCrud = CrudFactory(
+            User, cursor_column=User.id, facet_fields=[User.username]
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        dep = UserFacetCursorCrud.filter_params()
+        f = await dep(username=["alice"])
+        result = await UserFacetCursorCrud.cursor_paginate(
+            db_session, filter_by=f, schema=UserRead
+        )
+
+        assert len(result.data) == 1
+        assert result.data[0].username == "alice"
+
+    @pytest.mark.anyio
+    async def test_all_none_dep_result_passes_no_filter(self, db_session: AsyncSession):
+        """All-None dependency result results in no filter (returns all rows)."""
+        UserFacetCrud = CrudFactory(User, facet_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="bob", email="b@test.com")
+        )
+
+        dep = UserFacetCrud.filter_params()
+        f = await dep()  # all fields None
+        result = await UserFacetCrud.offset_paginate(
+            db_session, filter_by=f, schema=UserRead
+        )
+
+        assert isinstance(result.pagination, OffsetPagination)
+        assert result.pagination.total_count == 2
+
+
+class TestOrderParamsSchema:
+    """Tests for AsyncCrud.order_params()."""
+
+    def test_generates_order_by_and_order_params(self):
+        """Returned dependency has order_by and order query params."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params()
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert param_names == {"order_by", "order"}
+
+    def test_dependency_name_includes_model_name(self):
+        """Dependency function is named after the model."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        assert getattr(dep, "__name__") == "UserOrderParams"
+
+    def test_raises_when_no_order_fields(self):
+        """ValueError raised when no order_fields are configured or provided."""
+        with pytest.raises(ValueError, match="no order_fields"):
+            UserCrud.order_params()
+
+    def test_order_fields_override(self):
+        """order_fields= parameter overrides the class-level default."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params(order_fields=[User.email])
+
+        param_names = set(inspect.signature(dep).parameters)
+        assert "order_by" in param_names
+        # description should only mention email, not username
+        sig = inspect.signature(dep)
+        description = sig.parameters["order_by"].default.description
+        assert "email" in description
+        assert "username" not in description
+
+    def test_order_by_description_lists_valid_fields(self):
+        """order_by query param description mentions each allowed field."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params()
+
+        sig = inspect.signature(dep)
+        description = sig.parameters["order_by"].default.description
+        assert "username" in description
+        assert "email" in description
+
+    def test_default_order_reflected_in_order_default(self):
+        """default_order is used as the default value for order."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep_asc = UserOrderCrud.order_params(default_order="asc")
+        dep_desc = UserOrderCrud.order_params(default_order="desc")
+
+        sig_asc = inspect.signature(dep_asc)
+        sig_desc = inspect.signature(dep_desc)
+        assert sig_asc.parameters["order"].default.default == "asc"
+        assert sig_desc.parameters["order"].default.default == "desc"
+
+    @pytest.mark.anyio
+    async def test_no_order_by_no_default_returns_none(self):
+        """Returns None when order_by is absent and no default_field is set."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        result = await dep(order_by=None, order="asc")
+        assert result is None
+
+    @pytest.mark.anyio
+    async def test_no_order_by_with_default_field_returns_asc_expression(self):
+        """Returns default_field.asc() when order_by absent and order=asc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params(default_field=User.username)
+        result = await dep(order_by=None, order="asc")
+        assert isinstance(result, UnaryExpression)
+        assert "ASC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_no_order_by_with_default_field_returns_desc_expression(self):
+        """Returns default_field.desc() when order_by absent and order=desc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params(default_field=User.username)
+        result = await dep(order_by=None, order="desc")
+        assert isinstance(result, UnaryExpression)
+        assert "DESC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_valid_order_by_asc(self):
+        """Returns field.asc() for a valid order_by with order=asc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        result = await dep(order_by="username", order="asc")
+        assert isinstance(result, UnaryExpression)
+        assert "ASC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_valid_order_by_desc(self):
+        """Returns field.desc() for a valid order_by with order=desc."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        result = await dep(order_by="username", order="desc")
+        assert isinstance(result, UnaryExpression)
+        assert "DESC" in str(result)
+
+    @pytest.mark.anyio
+    async def test_invalid_order_by_raises_invalid_order_field_error(self):
+        """Raises InvalidOrderFieldError for an unknown order_by value."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        dep = UserOrderCrud.order_params()
+        with pytest.raises(InvalidOrderFieldError) as exc_info:
+            await dep(order_by="nonexistent", order="asc")
+        assert exc_info.value.field == "nonexistent"
+        assert "username" in exc_info.value.valid_fields
+
+    @pytest.mark.anyio
+    async def test_multiple_fields_all_resolve(self):
+        """All configured fields resolve correctly via order_by."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username, User.email])
+        dep = UserOrderCrud.order_params()
+        result_username = await dep(order_by="username", order="asc")
+        result_email = await dep(order_by="email", order="desc")
+        assert isinstance(result_username, ColumnElement)
+        assert isinstance(result_email, ColumnElement)
+
+    @pytest.mark.anyio
+    async def test_order_params_integrates_with_get_multi(
+        self, db_session: AsyncSession
+    ):
+        """order_params output is accepted by get_multi(order_by=...)."""
+        UserOrderCrud = CrudFactory(User, order_fields=[User.username])
+        await UserCrud.create(
+            db_session, UserCreate(username="charlie", email="c@test.com")
+        )
+        await UserCrud.create(
+            db_session, UserCreate(username="alice", email="a@test.com")
+        )
+
+        dep = UserOrderCrud.order_params()
+        order_by = await dep(order_by="username", order="asc")
+        results = await UserOrderCrud.get_multi(db_session, order_by=order_by)
+
+        assert results[0].username == "alice"
+        assert results[1].username == "charlie"

tests/test_example_pagination_search.py

@@ -0,0 +1,395 @@
+"""Live test for the docs/examples/pagination-search.md example.
+
+Spins up the exact FastAPI app described in the example (sourced from
+docs_src/examples/pagination_search/) and exercises it through a real HTTP
+client against a real PostgreSQL database.
+"""
+
+import datetime
+
+import pytest
+from fastapi import FastAPI
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from docs_src.examples.pagination_search.db import get_db
+from docs_src.examples.pagination_search.models import Article, Base, Category
+from docs_src.examples.pagination_search.routes import router
+from fastapi_toolsets.exceptions import init_exceptions_handlers
+
+from .conftest import DATABASE_URL
+
+
+def build_app(session: AsyncSession) -> FastAPI:
+    app = FastAPI()
+    init_exceptions_handlers(app)
+
+    async def override_get_db():
+        yield session
+
+    app.dependency_overrides[get_db] = override_get_db
+    app.include_router(router)
+    return app
+
+
+@pytest.fixture(scope="function")
+async def ex_db_session():
+    """Isolated session for the example models (separate tables from conftest)."""
+    engine = create_async_engine(DATABASE_URL, echo=False)
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    session_factory = async_sessionmaker(engine, expire_on_commit=False)
+    session = session_factory()
+
+    try:
+        yield session
+    finally:
+        await session.close()
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)
+        await engine.dispose()
+
+
+@pytest.fixture
+async def client(ex_db_session: AsyncSession):
+    app = build_app(ex_db_session)
+    async with AsyncClient(
+        transport=ASGITransport(app=app), base_url="http://test"
+    ) as ac:
+        yield ac
+
+
+async def seed(session: AsyncSession):
+    """Insert representative fixture data."""
+    python = Category(name="python")
+    backend = Category(name="backend")
+    session.add_all([python, backend])
+    await session.flush()
+
+    now = datetime.datetime(2024, 1, 1, tzinfo=datetime.timezone.utc)
+    session.add_all(
+        [
+            Article(
+                title="FastAPI tips",
+                body="Ten useful tips for FastAPI.",
+                status="published",
+                published=True,
+                category_id=python.id,
+                created_at=now,
+            ),
+            Article(
+                title="SQLAlchemy async",
+                body="How to use async SQLAlchemy.",
+                status="published",
+                published=True,
+                category_id=backend.id,
+                created_at=now + datetime.timedelta(seconds=1),
+            ),
+            Article(
+                title="Draft notes",
+                body="Work in progress.",
+                status="draft",
+                published=False,
+                category_id=None,
+                created_at=now + datetime.timedelta(seconds=2),
+            ),
+        ]
+    )
+    await session.commit()
+
+
+class TestAppSessionDep:
+    @pytest.mark.anyio
+    async def test_get_db_yields_async_session(self):
+        """get_db yields a real AsyncSession when called directly."""
+        from docs_src.examples.pagination_search.db import get_db
+
+        gen = get_db()
+        session = await gen.__anext__()
+        assert isinstance(session, AsyncSession)
+        await session.close()
+
+
+class TestOffsetPagination:
+    @pytest.mark.anyio
+    async def test_returns_all_articles(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 3
+        assert len(body["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_pagination_page_size(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?items_per_page=2&page=1")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 2
+        assert body["pagination"]["total_count"] == 3
+        assert body["pagination"]["has_more"] is True
+
+    @pytest.mark.anyio
+    async def test_full_text_search(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?search=fastapi")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 1
+        assert body["data"][0]["title"] == "FastAPI tips"
+
+    @pytest.mark.anyio
+    async def test_search_traverses_relationship(
+        self, client: AsyncClient, ex_db_session
+    ):
+        await seed(ex_db_session)
+
+        # "python" matches Category.name, not Article.title or body
+        resp = await client.get("/articles/offset?search=python")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 1
+        assert body["data"][0]["title"] == "FastAPI tips"
+
+    @pytest.mark.anyio
+    async def test_facet_filter_scalar(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?status=published")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 2
+        assert all(a["status"] == "published" for a in body["data"])
+
+    @pytest.mark.anyio
+    async def test_facet_filter_multi_value(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?status=published&status=draft")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 3
+
+    @pytest.mark.anyio
+    async def test_filter_attributes_in_response(
+        self, client: AsyncClient, ex_db_session
+    ):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        fa = body["filter_attributes"]
+        assert set(fa["status"]) == {"draft", "published"}
+        # "name" is unique across all facet fields — no prefix needed
+        assert set(fa["name"]) == {"backend", "python"}
+
+    @pytest.mark.anyio
+    async def test_filter_attributes_scoped_to_filter(
+        self, client: AsyncClient, ex_db_session
+    ):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?status=published")
+
+        body = resp.json()
+        # draft is filtered out → should not appear in filter_attributes
+        assert "draft" not in body["filter_attributes"]["status"]
+
+    @pytest.mark.anyio
+    async def test_search_and_filter_combined(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?search=async&status=published")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert body["pagination"]["total_count"] == 1
+        assert body["data"][0]["title"] == "SQLAlchemy async"
+
+
+class TestCursorPagination:
+    @pytest.mark.anyio
+    async def test_first_page(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?items_per_page=2")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 2
+        assert body["pagination"]["has_more"] is True
+        assert body["pagination"]["next_cursor"] is not None
+        assert body["pagination"]["prev_cursor"] is None
+
+    @pytest.mark.anyio
+    async def test_second_page(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        first = await client.get("/articles/cursor?items_per_page=2")
+        next_cursor = first.json()["pagination"]["next_cursor"]
+
+        resp = await client.get(
+            f"/articles/cursor?items_per_page=2&cursor={next_cursor}"
+        )
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 1
+        assert body["pagination"]["has_more"] is False
+
+    @pytest.mark.anyio
+    async def test_facet_filter(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?status=draft")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 1
+        assert body["data"][0]["status"] == "draft"
+
+    @pytest.mark.anyio
+    async def test_full_text_search(self, client: AsyncClient, ex_db_session):
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?search=sqlalchemy")
+
+        assert resp.status_code == 200
+        body = resp.json()
+        assert len(body["data"]) == 1
+        assert body["data"][0]["title"] == "SQLAlchemy async"
+
+
+class TestOffsetSorting:
+    """Tests for order_by / order query parameters on the offset endpoint."""
+
+    @pytest.mark.anyio
+    async def test_default_order_uses_created_at_asc(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """No order_by → default field (created_at) ASC."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["FastAPI tips", "SQLAlchemy async", "Draft notes"]
+
+    @pytest.mark.anyio
+    async def test_order_by_title_asc(self, client: AsyncClient, ex_db_session):
+        """order_by=title&order=asc returns alphabetical order."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?order_by=title&order=asc")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["Draft notes", "FastAPI tips", "SQLAlchemy async"]
+
+    @pytest.mark.anyio
+    async def test_order_by_title_desc(self, client: AsyncClient, ex_db_session):
+        """order_by=title&order=desc returns reverse alphabetical order."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?order_by=title&order=desc")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["SQLAlchemy async", "FastAPI tips", "Draft notes"]
+
+    @pytest.mark.anyio
+    async def test_order_by_created_at_desc(self, client: AsyncClient, ex_db_session):
+        """order_by=created_at&order=desc returns newest-first."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?order_by=created_at&order=desc")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["Draft notes", "SQLAlchemy async", "FastAPI tips"]
+
+    @pytest.mark.anyio
+    async def test_invalid_order_by_returns_422(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Unknown order_by field returns 422 with SORT-422 error code."""
+        resp = await client.get("/articles/offset?order_by=nonexistent_field")
+
+        assert resp.status_code == 422
+        body = resp.json()
+        assert body["error_code"] == "SORT-422"
+        assert body["status"] == "FAIL"
+
+
+class TestCursorSorting:
+    """Tests for order_by / order query parameters on the cursor endpoint.
+
+    In cursor_paginate the cursor_column is always the primary sort; order_by
+    acts as a secondary tiebreaker. With the seeded articles (all having unique
+    created_at values) the overall ordering is always created_at ASC regardless
+    of the order_by value — only the valid/invalid field check and the response
+    shape are meaningful here.
+    """
+
+    @pytest.mark.anyio
+    async def test_default_order_uses_created_at_asc(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """No order_by → default field (created_at) ASC."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor")
+
+        assert resp.status_code == 200
+        titles = [a["title"] for a in resp.json()["data"]]
+        assert titles == ["FastAPI tips", "SQLAlchemy async", "Draft notes"]
+
+    @pytest.mark.anyio
+    async def test_order_by_title_asc_accepted(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """order_by=title is a valid field — request succeeds and returns all articles."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?order_by=title&order=asc")
+
+        assert resp.status_code == 200
+        assert len(resp.json()["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_order_by_title_desc_accepted(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """order_by=title&order=desc is valid — request succeeds and returns all articles."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?order_by=title&order=desc")
+
+        assert resp.status_code == 200
+        assert len(resp.json()["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_invalid_order_by_returns_422(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Unknown order_by field returns 422 with SORT-422 error code."""
+        resp = await client.get("/articles/cursor?order_by=nonexistent_field")
+
+        assert resp.status_code == 422
+        body = resp.json()
+        assert body["error_code"] == "SORT-422"
+        assert body["status"] == "FAIL"

tests/test_exceptions.py

@@ -8,6 +8,7 @@ from fastapi_toolsets.exceptions import (
     ApiException,
     ConflictError,
     ForbiddenError,
+    InvalidOrderFieldError,
     NotFoundError,
     UnauthorizedError,
     generate_error_responses,
@@ -334,3 +335,43 @@ class TestExceptionIntegration:
 
         assert response.status_code == 200
         assert response.json() == {"id": 1}
+
+
+class TestInvalidOrderFieldError:
+    """Tests for InvalidOrderFieldError exception."""
+
+    def test_api_error_attributes(self):
+        """InvalidOrderFieldError has correct api_error metadata."""
+        assert InvalidOrderFieldError.api_error.code == 422
+        assert InvalidOrderFieldError.api_error.err_code == "SORT-422"
+        assert InvalidOrderFieldError.api_error.msg == "Invalid Order Field"
+
+    def test_stores_field_and_valid_fields(self):
+        """InvalidOrderFieldError stores field and valid_fields on the instance."""
+        error = InvalidOrderFieldError("unknown", ["name", "created_at"])
+        assert error.field == "unknown"
+        assert error.valid_fields == ["name", "created_at"]
+
+    def test_message_contains_field_and_valid_fields(self):
+        """Exception message mentions the bad field and valid options."""
+        error = InvalidOrderFieldError("bad_field", ["name", "email"])
+        assert "bad_field" in str(error)
+        assert "name" in str(error)
+        assert "email" in str(error)
+
+    def test_handled_as_422_by_exception_handler(self):
+        """init_exceptions_handlers turns InvalidOrderFieldError into a 422 response."""
+        app = FastAPI()
+        init_exceptions_handlers(app)
+
+        @app.get("/items")
+        async def list_items():
+            raise InvalidOrderFieldError("bad", ["name"])
+
+        client = TestClient(app)
+        response = client.get("/items")
+
+        assert response.status_code == 422
+        data = response.json()
+        assert data["error_code"] == "SORT-422"
+        assert data["status"] == "FAIL"

tests/test_fixtures.py

@@ -14,7 +14,9 @@ from fastapi_toolsets.fixtures import (
     load_fixtures_by_context,
 )
 
-from .conftest import Role, User
+from fastapi_toolsets.fixtures.utils import _get_primary_key
+
+from .conftest import IntRole, Permission, Role, User
 
 
 class TestContext:
@@ -597,6 +599,46 @@ class TestLoadFixtures:
         count = await RoleCrud.count(db_session)
         assert count == 2
 
+    @pytest.mark.anyio
+    async def test_skip_existing_skips_if_record_exists(self, db_session: AsyncSession):
+        """SKIP_EXISTING returns empty loaded list when the record already exists."""
+        registry = FixtureRegistry()
+        role_id = uuid.uuid4()
+
+        @registry.register
+        def roles():
+            return [Role(id=role_id, name="admin")]
+
+        # First load — inserts the record.
+        result1 = await load_fixtures(
+            db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result1["roles"]) == 1
+
+        # Remove from identity map so session.get() queries the DB in the second load.
+        db_session.expunge_all()
+
+        # Second load — record exists in DB, nothing should be added.
+        result2 = await load_fixtures(
+            db_session, registry, "roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert result2["roles"] == []
+
+    @pytest.mark.anyio
+    async def test_skip_existing_null_pk_inserts(self, db_session: AsyncSession):
+        """SKIP_EXISTING inserts when the instance has no PK set (auto-increment)."""
+        registry = FixtureRegistry()
+
+        @registry.register
+        def int_roles():
+            # No id provided — PK is None before INSERT (autoincrement).
+            return [IntRole(name="member")]
+
+        result = await load_fixtures(
+            db_session, registry, "int_roles", strategy=LoadStrategy.SKIP_EXISTING
+        )
+        assert len(result["int_roles"]) == 1
+
 
 class TestLoadFixturesByContext:
     """Tests for load_fixtures_by_context function."""
@@ -755,3 +797,19 @@ class TestGetObjByAttr:
         """Raises StopIteration when value type doesn't match."""
         with pytest.raises(StopIteration):
             get_obj_by_attr(self.roles, "id", "not-a-uuid")
+
+
+class TestGetPrimaryKey:
+    """Unit tests for the _get_primary_key helper (composite PK paths)."""
+
+    def test_composite_pk_all_set(self):
+        """Returns a tuple when all composite PK values are set."""
+        instance = Permission(subject="post", action="read")
+        pk = _get_primary_key(instance)
+        assert pk == ("post", "read")
+
+    def test_composite_pk_partial_none(self):
+        """Returns None when any composite PK value is None."""
+        instance = Permission(subject="post")  # action is None
+        pk = _get_primary_key(instance)
+        assert pk is None

tests/test_schemas.py

@@ -9,7 +9,6 @@ from fastapi_toolsets.schemas import (
     ErrorResponse,
     OffsetPagination,
     PaginatedResponse,
-    Pagination,
     Response,
     ResponseStatus,
 )
@@ -199,20 +198,6 @@ class TestOffsetPagination:
         assert data["page"] == 2
         assert data["has_more"] is True
 
-    def test_pagination_alias_is_offset_pagination(self):
-        """Pagination is a backward-compatible alias for OffsetPagination."""
-        assert Pagination is OffsetPagination
-
-    def test_pagination_alias_constructs_offset_pagination(self):
-        """Code using Pagination(...) still works unchanged."""
-        pagination = Pagination(
-            total_count=10,
-            items_per_page=5,
-            page=2,
-            has_more=False,
-        )
-        assert isinstance(pagination, OffsetPagination)
-
 
 class TestCursorPagination:
     """Tests for CursorPagination schema."""
@@ -276,7 +261,7 @@ class TestPaginatedResponse:
 
     def test_create_paginated_response(self):
         """Create PaginatedResponse with data and pagination."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=30,
             items_per_page=10,
             page=1,
@@ -294,7 +279,7 @@ class TestPaginatedResponse:
 
     def test_with_custom_message(self):
         """PaginatedResponse with custom message."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=5,
             items_per_page=10,
             page=1,
@@ -310,7 +295,7 @@ class TestPaginatedResponse:
 
     def test_empty_data(self):
         """PaginatedResponse with empty data."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=0,
             items_per_page=10,
             page=1,
@@ -332,7 +317,7 @@ class TestPaginatedResponse:
             id: int
             name: str
 
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=1,
             items_per_page=10,
             page=1,
@@ -347,7 +332,7 @@ class TestPaginatedResponse:
 
     def test_serialization(self):
         """PaginatedResponse serializes correctly."""
-        pagination = Pagination(
+        pagination = OffsetPagination(
             total_count=100,
             items_per_page=10,
             page=5,
@@ -385,16 +370,6 @@ class TestPaginatedResponse:
         )
         assert isinstance(response.pagination, CursorPagination)
 
-    def test_pagination_alias_accepted(self):
-        """Constructing PaginatedResponse with Pagination (alias) still works."""
-        response = PaginatedResponse(
-            data=[],
-            pagination=Pagination(
-                total_count=0, items_per_page=10, page=1, has_more=False
-            ),
-        )
-        assert isinstance(response.pagination, OffsetPagination)
-
 
 class TestFromAttributes:
     """Tests for from_attributes config (ORM mode)."""

uv.lock

@@ -235,7 +235,7 @@ wheels = [
 
 [[package]]
 name = "fastapi"
-version = "0.129.0"
+version = "0.133.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "annotated-doc" },
@@ -244,14 +244,14 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "typing-inspection" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/48/47/75f6bea02e797abff1bca968d5997793898032d9923c1935ae2efdece642/fastapi-0.129.0.tar.gz", hash = "sha256:61315cebd2e65df5f97ec298c888f9de30430dd0612d59d6480beafbc10655af", size = 375450, upload-time = "2026-02-12T13:54:52.541Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/22/6f/0eafed8349eea1fa462238b54a624c8b408cd1ba2795c8e64aa6c34f8ab7/fastapi-0.133.1.tar.gz", hash = "sha256:ed152a45912f102592976fde6cbce7dae1a8a1053da94202e51dd35d184fadd6", size = 378741, upload-time = "2026-02-25T18:18:17.398Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/9e/dd/d0ee25348ac58245ee9f90b6f3cbb666bf01f69be7e0911f9851bddbda16/fastapi-0.129.0-py3-none-any.whl", hash = "sha256:b4946880e48f462692b31c083be0432275cbfb6e2274566b1be91479cc1a84ec", size = 102950, upload-time = "2026-02-12T13:54:54.528Z" },
+    { url = "https://files.pythonhosted.org/packages/d2/c9/a175a7779f3599dfa4adfc97a6ce0e157237b3d7941538604aadaf97bfb6/fastapi-0.133.1-py3-none-any.whl", hash = "sha256:658f34ba334605b1617a65adf2ea6461901bdb9af3a3080d63ff791ecf7dc2e2", size = 109029, upload-time = "2026-02-25T18:18:18.578Z" },
 ]
 
 [[package]]
 name = "fastapi-toolsets"
-version = "1.1.2"
+version = "1.3.0"
 source = { editable = "." }
 dependencies = [
     { name = "asyncpg" },
@@ -413,30 +413,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/e1/2b/98c7f93e6db9977aaee07eb1e51ca63bd5f779b900d362791d3252e60558/greenlet-3.3.1-cp314-cp314t-win_amd64.whl", hash = "sha256:301860987846c24cb8964bdec0e31a96ad4a2a801b41b4ef40963c1b44f33451", size = 233181, upload-time = "2026-01-23T15:33:00.29Z" },
 ]
 
-[[package]]
-name = "griffe"
-version = "2.0.0"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "griffecli" },
-    { name = "griffelib" },
-]
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/8b/94/ee21d41e7eb4f823b94603b9d40f86d3c7fde80eacc2c3c71845476dddaa/griffe-2.0.0-py3-none-any.whl", hash = "sha256:5418081135a391c3e6e757a7f3f156f1a1a746cc7b4023868ff7d5e2f9a980aa", size = 5214, upload-time = "2026-02-09T19:09:44.105Z" },
-]
-
-[[package]]
-name = "griffecli"
-version = "2.0.0"
-source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "colorama" },
-    { name = "griffelib" },
-]
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/e6/ed/d93f7a447bbf7a935d8868e9617cbe1cadf9ee9ee6bd275d3040fbf93d60/griffecli-2.0.0-py3-none-any.whl", hash = "sha256:9f7cd9ee9b21d55e91689358978d2385ae65c22f307a63fb3269acf3f21e643d", size = 9345, upload-time = "2026-02-09T19:09:42.554Z" },
-]
-
 [[package]]
 name = "griffelib"
 version = "2.0.0"
@@ -696,16 +672,16 @@ wheels = [
 
 [[package]]
 name = "mkdocstrings-python"
-version = "2.0.2"
+version = "2.0.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "griffe" },
+    { name = "griffelib" },
     { name = "mkdocs-autorefs" },
     { name = "mkdocstrings" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/25/84/78243847ad9d5c21d30a2842720425b17e880d99dfe824dee11d6b2149b4/mkdocstrings_python-2.0.2.tar.gz", hash = "sha256:4a32ccfc4b8d29639864698e81cfeb04137bce76bb9f3c251040f55d4b6e1ad8", size = 199124, upload-time = "2026-02-09T15:12:01.543Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/29/33/c225eaf898634bdda489a6766fc35d1683c640bffe0e0acd10646b13536d/mkdocstrings_python-2.0.3.tar.gz", hash = "sha256:c518632751cc869439b31c9d3177678ad2bfa5c21b79b863956ad68fc92c13b8", size = 199083, upload-time = "2026-02-20T10:38:36.368Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/32/28/79f0f8de97cce916d5ae88a7bee1ad724855e83e6019c0b4d5b3fabc80f3/mkdocstrings_python-2.0.3-py3-none-any.whl", hash = "sha256:0b83513478bdfd803ff05aa43e9b1fca9dd22bcd9471f09ca6257f009bc5ee12", size = 104779, upload-time = "2026-02-20T10:38:34.517Z" },
 ]
 
 [[package]]
@@ -1037,27 +1013,27 @@ wheels = [
 
 [[package]]
 name = "ruff"
-version = "0.15.1"
+version = "0.15.2"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/04/dc/4e6ac71b511b141cf626357a3946679abeba4cf67bc7cc5a17920f31e10d/ruff-0.15.1.tar.gz", hash = "sha256:c590fe13fb57c97141ae975c03a1aedb3d3156030cabd740d6ff0b0d601e203f", size = 4540855, upload-time = "2026-02-12T23:09:09.998Z" }
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 [[package]]
 name = "typer"
-version = "0.24.0"
+version = "0.24.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "annotated-doc" },
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     { name = "rich" },
     { name = "shellingham" },
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 [[package]]

zensical.toml

@@ -1,265 +1,35 @@
-# ============================================================================
-#
-# The configuration produced by default is meant to highlight the features
-# that Zensical provides and to serve as a starting point for your own
-# projects.
-#
-# ============================================================================
-
 [project]
-
-# The site_name is shown in the page header and the browser window title
-#
-# Read more: https://zensical.org/docs/setup/basics/#site_name
 site_name = "FastAPI Toolsets"
-
-# The site_description is included in the HTML head and should contain a
-# meaningful description of the site content for use by search engines.
-#
-# Read more: https://zensical.org/docs/setup/basics/#site_description
 site_description = "Production-ready utilities for FastAPI applications."
-
-# The site_author attribute. This is used in the HTML head element.
-#
-# Read more: https://zensical.org/docs/setup/basics/#site_author
 site_author = "d3vyce"
-
-# The site_url is the canonical URL for your site. When building online
-# documentation you should set this.
-# Read more: https://zensical.org/docs/setup/basics/#site_url
 site_url = "https://fastapi-toolsets.d3vyce.fr"
-
+copyright = "Copyright © 2026 d3vyce"
-# The copyright notice appears in the page footer and can contain an HTML
-# fragment.
-#
-# Read more: https://zensical.org/docs/setup/basics/#copyright
-copyright = """
-Copyright © 2026 d3vyce
-"""
-
 repo_url = "https://github.com/d3vyce/fastapi-toolsets"
 
-# Zensical supports both implicit navigation and explicitly defined navigation.
-# If you decide not to define a navigation here then Zensical will simply
-# derive the navigation structure from the directory structure of your
-# "docs_dir". The definition below demonstrates how a navigation structure
-# can be defined using TOML syntax.
-#
-# Read more: https://zensical.org/docs/setup/navigation/
-# nav = [
-#   { "Get started" = "index.md" },
-#   { "Markdown in 5min" = "markdown.md" },
-# ]
-
-# With the "extra_css" option you can add your own CSS styling to customize
-# your Zensical project according to your needs. You can add any number of
-# CSS files.
-#
-# The path provided should be relative to the "docs_dir".
-#
-# Read more: https://zensical.org/docs/customization/#additional-css
-#
-#extra_css = ["stylesheets/extra.css"]
-
-# With the `extra_javascript` option you can add your own JavaScript to your
-# project to customize the behavior according to your needs.
-#
-# The path provided should be relative to the "docs_dir".
-#
-# Read more: https://zensical.org/docs/customization/#additional-javascript
-#extra_javascript = ["javascripts/extra.js"]
-
-# ----------------------------------------------------------------------------
-# Section for configuring theme options
-# ----------------------------------------------------------------------------
 [project.theme]
-
-# change this to "classic" to use the traditional Material for MkDocs look.
-#variant = "classic"
-
-# Zensical allows you to override specific blocks, partials, or whole
-# templates as well as to define your own templates. To do this, uncomment
-# the custom_dir setting below and set it to a directory in which you
-# keep your template overrides.
-#
-# Read more:
-# - https://zensical.org/docs/customization/#extending-the-theme
-#
 custom_dir = "docs/overrides"
-
-# With the "favicon" option you can set your own image to use as the icon
-# browsers will use in the browser title bar or tab bar. The path provided
-# must be relative to the "docs_dir".
-#
-# Read more:
-# - https://zensical.org/docs/setup/logo-and-icons/#favicon
-# - https://developer.mozilla.org/en-US/docs/Glossary/Favicon
-#
-#favicon = "images/favicon.png"
-
-# Zensical supports more than 60 different languages. This means that the
-# labels and tooltips that Zensical's templates produce are translated.
-# The "language" option allows you to set the language used. This language
-# is also indicated in the HTML head element to help with accessibility
-# and guide search engines and translation tools.
-#
-# The default language is "en" (English). It is possible to create
-# sites with multiple languages and configure a language selector. See
-# the documentation for details.
-#
-# Read more:
-# - https://zensical.org/docs/setup/language/
-#
 language = "en"
-
-# Zensical provides a number of feature toggles that change the behavior
-# of the documentation site.
 features = [
-    # Zensical includes an announcement bar. This feature allows users to
-    # dismiss it when they have read the announcement.
-    # https://zensical.org/docs/setup/header/#announcement-bar
     "announce.dismiss",
-
-    # If you have a repository configured and turn on this feature, Zensical
-    # will generate an edit button for the page. This works for common
-    # repository hosting services.
-    # https://zensical.org/docs/setup/repository/#content-actions
-    #"content.action.edit",
-
-    # If you have a repository configured and turn on this feature, Zensical
-    # will generate a button that allows the user to view the Markdown
-    # code for the current page.
-    # https://zensical.org/docs/setup/repository/#content-actions
     "content.action.view",
-
-    # Code annotations allow you to add an icon with a tooltip to your
-    # code blocks to provide explanations at crucial points.
-    # https://zensical.org/docs/authoring/code-blocks/#code-annotations
     "content.code.annotate",
-
-    # This feature turns on a button in code blocks that allow users to
-    # copy the content to their clipboard without first selecting it.
-    # https://zensical.org/docs/authoring/code-blocks/#code-copy-button
     "content.code.copy",
-
-    # Code blocks can include a button to allow for the selection of line
-    # ranges by the user.
-    # https://zensical.org/docs/authoring/code-blocks/#code-selection-button
     "content.code.select",
-
-    # Zensical can render footnotes as inline tooltips, so the user can read
-    # the footnote without leaving the context of the document.
-    # https://zensical.org/docs/authoring/footnotes/#footnote-tooltips
     "content.footnote.tooltips",
-
-    # If you have many content tabs that have the same titles (e.g., "Python",
-    # "JavaScript", "Cobol"), this feature causes all of them to switch to
-    # at the same time when the user chooses their language in one.
-    # https://zensical.org/docs/authoring/content-tabs/#linked-content-tabs
     "content.tabs.link",
-
-    # With this feature enabled users can add tooltips to links that will be
-    # displayed when the mouse pointer hovers the link.
-    # https://zensical.org/docs/authoring/tooltips/#improved-tooltips
     "content.tooltips",
-
-    # With this feature enabled, Zensical will automatically hide parts
-    # of the header when the user scrolls past a certain point.
-    # https://zensical.org/docs/setup/header/#automatic-hiding
-    # "header.autohide",
-
-    # Turn on this feature to expand all collapsible sections in the
-    # navigation sidebar by default.
-    # https://zensical.org/docs/setup/navigation/#navigation-expansion
-    # "navigation.expand",
-
-    # This feature turns on navigation elements in the footer that allow the
-    # user to navigate to a next or previous page.
-    # https://zensical.org/docs/setup/footer/#navigation
     "navigation.footer",
-
-    # When section index pages are enabled, documents can be directly attached
-    # to sections, which is particularly useful for providing overview pages.
-    # https://zensical.org/docs/setup/navigation/#section-index-pages
     "navigation.indexes",
-
-    # When instant navigation is enabled, clicks on all internal links will be
-    # intercepted and dispatched via XHR without fully reloading the page.
-    # https://zensical.org/docs/setup/navigation/#instant-navigation
     "navigation.instant",
-
-    # With instant prefetching, your site will start to fetch a page once the
-    # user hovers over a link. This will reduce the perceived loading time
-    # for the user.
-    # https://zensical.org/docs/setup/navigation/#instant-prefetching
     "navigation.instant.prefetch",
-
-    # In order to provide a better user experience on slow connections when
-    # using instant navigation, a progress indicator can be enabled.
-    # https://zensical.org/docs/setup/navigation/#progress-indicator
-    #"navigation.instant.progress",
-
-    # When navigation paths are activated, a breadcrumb navigation is rendered
-    # above the title of each page
-    # https://zensical.org/docs/setup/navigation/#navigation-path
     "navigation.path",
-
-    # When pruning is enabled, only the visible navigation items are included
-    # in the rendered HTML, reducing the size of the built site by 33% or more.
-    # https://zensical.org/docs/setup/navigation/#navigation-pruning
-    #"navigation.prune",
-
-    # When sections are enabled, top-level sections are rendered as groups in
-    # the sidebar for viewports above 1220px, but remain as-is on mobile.
-    # https://zensical.org/docs/setup/navigation/#navigation-sections
     "navigation.sections",
-
-    # When tabs are enabled, top-level sections are rendered in a menu layer
-    # below the header for viewports above 1220px, but remain as-is on mobile.
-    # https://zensical.org/docs/setup/navigation/#navigation-tabs
     "navigation.tabs",
-
-    # When sticky tabs are enabled, navigation tabs will lock below the header
-    # and always remain visible when scrolling down.
-    # https://zensical.org/docs/setup/navigation/#sticky-navigation-tabs
-    #"navigation.tabs.sticky",
-
-    # A back-to-top button can be shown when the user, after scrolling down,
-    # starts to scroll up again.
-    # https://zensical.org/docs/setup/navigation/#back-to-top-button
     "navigation.top",
-
-    # When anchor tracking is enabled, the URL in the address bar is
-    # automatically updated with the active anchor as highlighted in the table
-    # of contents.
-    # https://zensical.org/docs/setup/navigation/#anchor-tracking
     "navigation.tracking",
-
-    # When search highlighting is enabled and a user clicks on a search result,
-    # Zensical will highlight all occurrences after following the link.
-    # https://zensical.org/docs/setup/search/#search-highlighting
     "search.highlight",
-
-    # When anchor following for the table of contents is enabled, the sidebar
-    # is automatically scrolled so that the active anchor is always visible.
-    # https://zensical.org/docs/setup/navigation/#anchor-following
-    # "toc.follow",
-
-    # When navigation integration for the table of contents is enabled, it is
-    # always rendered as part of the navigation sidebar on the left.
-    # https://zensical.org/docs/setup/navigation/#navigation-integration
-    #"toc.integrate",
 ]
 
-# ----------------------------------------------------------------------------
-# In the "palette" subsection you can configure options for the color scheme.
-# You can configure different color # schemes, e.g., to turn on dark mode,
-# that the user can switch between. Each color scheme can be further
-# customized.
-#
-# Read more:
-# - https://zensical.org/docs/setup/colors/
-# ----------------------------------------------------------------------------
 [[project.theme.palette]]
 scheme = "default"
 toggle.icon = "lucide/sun"
@@ -270,43 +40,13 @@ scheme = "slate"
 toggle.icon = "lucide/moon"
 toggle.name = "Switch to light mode"
 
-# ----------------------------------------------------------------------------
-# In the "font" subsection you can configure the fonts used. By default, fonts
-# are loaded from Google Fonts, giving you a wide range of choices from a set
-# of suitably licensed fonts. There are options for a normal text font and for
-# a monospaced font used in code blocks.
-# ----------------------------------------------------------------------------
 [project.theme.font]
 text = "Inter"
 code = "Jetbrains Mono"
 
-# ----------------------------------------------------------------------------
-# You can configure your own logo to be shown in the header using the "logo"
-# option in the "icons" subsection. The logo can be a path to a file in your
-# "docs_dir" or it can be a path to an icon.
-#
-# Likewise, you can customize the logo used for the repository section of the
-# header. Zensical derives the default logo for this from the repository URL.
-# See below...
-#
-# There are other icons you can customize. See the documentation for details.
-#
-# Read more:
-# - https://zensical.org/docs/setup/logo-and-icons
-# - https://zensical.org/docs/authoring/icons-emojis/#search
-# ----------------------------------------------------------------------------
 [project.theme.icon]
-#logo = "lucide/smile"
 repo = "fontawesome/brands/github"
 
-# ----------------------------------------------------------------------------
-# The "extra" section contains miscellaneous settings.
-# ----------------------------------------------------------------------------
-#[[project.extra.social]]
-#icon = "fontawesome/brands/github"
-#link = "https://github.com/user/repo"
-
-
 [project.plugins.mkdocstrings.handlers.python]
 inventories = ["https://docs.python.org/3/objects.inv"]
 paths = ["src"]
@@ -316,3 +56,42 @@ docstring_style = "google"
 inherited_members = true
 show_source = false
 show_root_heading = true
+
+[project.markdown_extensions]
+abbr = {}
+admonition = {}
+attr_list = {}
+def_list = {}
+footnotes = {}
+md_in_html = {}
+"pymdownx.arithmatex" = {generic = true}
+"pymdownx.betterem" = {}
+"pymdownx.caret" = {}
+"pymdownx.details" = {}
+"pymdownx.emoji" = {}
+"pymdownx.inlinehilite" = {}
+"pymdownx.keys" = {}
+"pymdownx.magiclink" = {}
+"pymdownx.mark" = {}
+"pymdownx.smartsymbols" = {}
+"pymdownx.tasklist" = {custom_checkbox = true}
+"pymdownx.tilde" = {}
+
+[project.markdown_extensions."pymdownx.highlight"]
+anchor_linenums = true
+line_spans = "__span"
+pygments_lang_class = true
+
+[project.markdown_extensions."pymdownx.superfences"]
+custom_fences = [{name = "mermaid", class = "mermaid"}]
+
+[project.markdown_extensions."pymdownx.tabbed"]
+alternate_style = true
+combine_header_slug = true
+
+[project.markdown_extensions."toc"]
+permalink = true
+
+[project.markdown_extensions."pymdownx.snippets"]
+base_path = ["."]
+check_paths = true