docs: add sorting

docs/examples/pagination-search.md

@@ -1,6 +1,6 @@
 # Pagination & search
 
-This example builds an articles listing endpoint that supports **offset pagination**, **cursor pagination**, **full-text search**, and **faceted filtering** — all from a single `CrudFactory` definition.
+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
 
@@ -16,7 +16,7 @@ This example builds an articles listing endpoint that supports **offset paginati
 
 ## Crud
 
-Declare `facet_fields` and `searchable_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.
+Declare `searchable_fields`, `facet_fields`, and `sort_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"
@@ -46,14 +46,14 @@ Declare `facet_fields` and `searchable_fields` once on [`CrudFactory`](../refere
 
 Best for admin panels or any UI that needs a total item count and numbered pages.
 
-```python title="routes.py:1:27"
---8<-- "docs_src/examples/pagination_search/routes.py:1:27"
+```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
+GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published&sort_by=title&sort_order=asc
 ```
 
 **Example response**
@@ -83,14 +83,14 @@ GET /articles/offset?page=2&items_per_page=10&search=fastapi&status=published
 
 Best for feeds, infinite scroll, or any high-throughput API where offset performance degrades.
 
-```python title="routes.py:30:45"
---8<-- "docs_src/examples/pagination_search/routes.py:30:45"
+```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
+GET /articles/cursor?items_per_page=10&status=published&sort_by=created_at&sort_order=desc
 ```
 
 **Example response**

docs/module/crud.md

@@ -295,6 +295,8 @@ Use `filter_by` to pass the client's chosen filter values directly — no need t
 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(
@@ -306,7 +308,7 @@ UserCrud = CrudFactory(
 async def list_users(
     session: SessionDep,
     page: int = 1,
-    filter_by: dict[str, list[str]] = Depends(UserCrud.filter_params()),
+    filter_by: Annotated[dict[str, list[str]], Depends(UserCrud.filter_params())],
 ) -> PaginatedResponse[UserRead]:
     return await UserCrud.offset_paginate(
         session=session,
@@ -323,6 +325,58 @@ GET /users?status=active&country=FR   → filter_by={"status": ["active"], "coun
 GET /users?role=admin&role=editor     → filter_by={"role": ["admin", "editor"]}  (IN clause)
 ```
 
+## Sorting
+
+!!! info "Added in `v1.3`"
+
+Declare `sort_fields` on the CRUD class to expose client-driven column ordering via `sort_by` and `sort_order` query parameters.
+
+```python
+UserCrud = CrudFactory(
+    model=User,
+    sort_fields=[
+        User.name,
+        User.created_at,
+    ],
+)
+```
+
+Call [`sort_params()`](../reference/crud.md#fastapi_toolsets.crud.factory.AsyncCrud.sort_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.sort_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               |
+| ------------ | ------------------ |
+| `sort_by`    | `str | null`      |
+| `sort_order` | `asc` or `desc` |
+
+```
+GET /users?sort_by=name&sort_order=asc   → ORDER BY users.name ASC
+GET /users?sort_by=name&sort_order=desc  → ORDER BY users.name DESC
+```
+
+An unknown `sort_by` value raises [`InvalidSortFieldError`](../reference/exceptions.md#fastapi_toolsets.exceptions.exceptions.InvalidSortFieldError) (HTTP 422).
+
+You can also pass `sort_fields` directly to `sort_params()` to override the class-level defaults without modifying them:
+
+```python
+UserSortParams = UserCrud.sort_params(sort_fields=[User.name])
+```
+
 ## Relationship loading
 
 !!! info "Added in `v1.1`"

docs_src/examples/pagination_search/app.py

@@ -1,6 +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

@@ -14,6 +14,8 @@ ArticleCrud = CrudFactory(
         Article.status,
         (Article.category, Category.name),
     ],
+    sort_fields=[  # fields exposed for client-driven sorting
+        Article.title,
+        Article.created_at,
+    ],
 )
-
-ArticleFilters = ArticleCrud.filter_params()

docs_src/examples/pagination_search/routes.py

@@ -1,9 +1,13 @@
+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")
@@ -12,10 +16,14 @@ 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.sort_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,
-    filter_by: dict[str, list[str]] = Depends(ArticleCrud.filter_params()),
 ) -> PaginatedResponse[ArticleRead]:
     return await ArticleCrud.offset_paginate(
         session=session,
@@ -23,6 +31,7 @@ async def list_articles_offset(
         items_per_page=items_per_page,
         search=search,
         filter_by=filter_by or None,
+        order_by=order_by,
         schema=ArticleRead,
     )
 
@@ -30,10 +39,14 @@ async def list_articles_offset(
 @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.sort_params(default_field=Article.created_at)),
+    ],
     cursor: str | None = None,
     items_per_page: int = Query(20, ge=1, le=100),
     search: str | None = None,
-    filter_by: dict[str, list[str]] = Depends(ArticleCrud.filter_params()),
 ) -> PaginatedResponse[ArticleRead]:
     return await ArticleCrud.cursor_paginate(
         session=session,
@@ -41,5 +54,6 @@ async def list_articles_cursor(
         items_per_page=items_per_page,
         search=search,
         filter_by=filter_by or None,
+        order_by=order_by,
         schema=ArticleRead,
     )

tests/test_example_pagination_search.py

@@ -15,12 +15,14 @@ from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_asyn
 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
@@ -269,3 +271,123 @@ class TestCursorPagination:
         body = resp.json()
         assert len(body["data"]) == 1
         assert body["data"][0]["title"] == "SQLAlchemy async"
+
+
+class TestOffsetSorting:
+    """Tests for sort_by / sort_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 sort_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_sort_by_title_asc(self, client: AsyncClient, ex_db_session):
+        """sort_by=title&sort_order=asc returns alphabetical order."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?sort_by=title&sort_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_sort_by_title_desc(self, client: AsyncClient, ex_db_session):
+        """sort_by=title&sort_order=desc returns reverse alphabetical order."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?sort_by=title&sort_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_sort_by_created_at_desc(self, client: AsyncClient, ex_db_session):
+        """sort_by=created_at&sort_order=desc returns newest-first."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/offset?sort_by=created_at&sort_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_sort_by_returns_422(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Unknown sort_by field returns 422 with SORT-422 error code."""
+        resp = await client.get("/articles/offset?sort_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 sort_by / sort_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 sort_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 sort_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_sort_by_title_asc_accepted(self, client: AsyncClient, ex_db_session):
+        """sort_by=title is a valid field — request succeeds and returns all articles."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?sort_by=title&sort_order=asc")
+
+        assert resp.status_code == 200
+        assert len(resp.json()["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_sort_by_title_desc_accepted(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """sort_by=title&sort_order=desc is valid — request succeeds and returns all articles."""
+        await seed(ex_db_session)
+
+        resp = await client.get("/articles/cursor?sort_by=title&sort_order=desc")
+
+        assert resp.status_code == 200
+        assert len(resp.json()["data"]) == 3
+
+    @pytest.mark.anyio
+    async def test_invalid_sort_by_returns_422(
+        self, client: AsyncClient, ex_db_session
+    ):
+        """Unknown sort_by field returns 422 with SORT-422 error code."""
+        resp = await client.get("/articles/cursor?sort_by=nonexistent_field")
+
+        assert resp.status_code == 422
+        body = resp.json()
+        assert body["error_code"] == "SORT-422"
+        assert body["status"] == "FAIL"