chore: cleanup before v1 (#73)

* chore: move dependencies module to the project root

* chore:update README

* chore: clean conftest

* chore: remove old code + comment

* fix: uv.lock dependencies

README.md

@@ -1,6 +1,6 @@
 # FastAPI Toolsets
 
-FastAPI Toolsets provides production-ready utilities for FastAPI applications built with async SQLAlchemy and PostgreSQL. It includes generic CRUD operations, a fixture system with dependency resolution, a Django-like CLI, standardized API responses, and structured exception handling with automatic OpenAPI documentation.
+A modular collection of production-ready utilities for FastAPI. Install only what you need — from async CRUD and database helpers to CLI tooling, Prometheus metrics, and pytest fixtures. Each module is independently installable via optional extras, keeping your dependency footprint minimal.
 
 [![CI](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml/badge.svg)](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/d3vyce/fastapi-toolsets/graph/badge.svg)](https://codecov.io/gh/d3vyce/fastapi-toolsets)
@@ -20,20 +20,42 @@ FastAPI Toolsets provides production-ready utilities for FastAPI applications bu
 
 ## Installation
 
+The base package includes the core modules (CRUD, database, schemas, exceptions, fixtures, dependencies, logging):
+
 ```bash
 uv add fastapi-toolsets
 ```
 
+Install only the extras you need:
+
+```bash
+uv add "fastapi-toolsets[cli]"      # CLI (typer)
+uv add "fastapi-toolsets[metrics]"  # Prometheus metrics (prometheus_client)
+uv add "fastapi-toolsets[pytest]"   # Pytest helpers (httpx, pytest-xdist)
+```
+
+Or install everything:
+
+```bash
+uv add "fastapi-toolsets[all]"
+```
+
 ## Features
 
+### Core
+
 - **CRUD**: Generic async CRUD operations with `CrudFactory`, built-in search with relationship traversal
 - **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
-- **CLI**: Django-like command-line interface with fixture management and custom commands support
 - **Standardized API Responses**: Consistent response format with `Response`, `PaginatedResponse`, and `PydanticBase`
 - **Exception Handling**: Structured error responses with automatic OpenAPI documentation
 - **Logging**: Logging configuration with uvicorn integration via `configure_logging` and `get_logger`
+
+### Optional
+
+- **CLI**: Django-like command-line interface with fixture management and custom commands support
+- **Metrics**: Prometheus metrics endpoint with provider/collector registry
 - **Pytest Helpers**: Async test client, database session management, `pytest-xdist` support, and table cleanup utilities
 
 ## License

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "fastapi-toolsets"
-version = "0.9.0"
+version = "0.10.0"
 description = "Reusable tools for FastAPI: async CRUD, fixtures, CLI, and standardized responses for SQLAlchemy + PostgreSQL"
 readme = "README.md"
 license = "MIT"
@@ -31,12 +31,10 @@ classifiers = [
     "Typing :: Typed",
 ]
 dependencies = [
-    "fastapi>=0.100.0",
-    "sqlalchemy[asyncio]>=2.0",
     "asyncpg>=0.29.0",
+    "fastapi>=0.100.0",
     "pydantic>=2.0",
-    "typer>=0.9.0",
-    "httpx>=0.25.0",
+    "sqlalchemy[asyncio]>=2.0",
 ]
 
 [project.urls]
@@ -46,15 +44,28 @@ Repository = "https://github.com/d3vyce/fastapi-toolsets"
 Issues = "https://github.com/d3vyce/fastapi-toolsets/issues"
 
 [project.optional-dependencies]
-test = [
-    "pytest>=8.0.0",
-    "pytest-anyio>=0.0.0",
+cli = [
+    "typer>=0.9.0",
+]
+metrics = [
+    "prometheus_client>=0.20.0",
+]
+pytest = [
+    "httpx>=0.25.0",
     "pytest-xdist>=3.0.0",
+    "pytest>=8.0.0",
+]
+all = [
+    "fastapi-toolsets[cli,metrics,pytest]",
+]
+test = [
     "coverage>=7.0.0",
+    "fastapi-toolsets[pytest]",
+    "pytest-anyio>=0.0.0",
     "pytest-cov>=4.0.0",
 ]
 dev = [
-    "fastapi-toolsets[test]",
+    "fastapi-toolsets[all,test]",
     "ruff>=0.1.0",
     "ty>=0.0.1a0",
 ]

src/fastapi_toolsets/__init__.py

@@ -21,4 +21,4 @@ Example usage:
         return Response(data={"user": user.username}, message="Success")
 """
 
-__version__ = "0.9.0"
+__version__ = "0.10.0"

src/fastapi_toolsets/_imports.py

@@ -0,0 +1,9 @@
+"""Optional dependency helpers."""
+
+
+def require_extra(package: str, extra: str) -> None:
+    """Raise *ImportError* with an actionable install instruction."""
+    raise ImportError(
+        f"'{package}' is required to use this module. "
+        f"Install it with: pip install fastapi-toolsets[{extra}]"
+    )

src/fastapi_toolsets/cli/app.py

@@ -1,6 +1,11 @@
 """Main CLI application."""
 
-import typer
+try:
+    import typer
+except ImportError:
+    from .._imports import require_extra
+
+    require_extra(package="typer", extra="cli")
 
 from ..logger import configure_logging
 from .config import get_custom_cli

src/fastapi_toolsets/crud/__init__.py

@@ -1,7 +1,7 @@
 """Generic async CRUD operations for SQLAlchemy models."""
 
 from ..exceptions import NoSearchableFieldsError
-from .factory import CrudFactory
+from .factory import CrudFactory, JoinType, M2MFieldType
 from .search import (
     SearchConfig,
     get_searchable_fields,
@@ -10,6 +10,8 @@ from .search import (
 __all__ = [
     "CrudFactory",
     "get_searchable_fields",
+    "JoinType",
+    "M2MFieldType",
     "NoSearchableFieldsError",
     "SearchConfig",
 ]

src/fastapi_toolsets/crud/factory.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from collections.abc import Sequence
+from collections.abc import Mapping, Sequence
 from typing import Any, ClassVar, Generic, Literal, Self, TypeVar, cast, overload
 
 from pydantic import BaseModel
@@ -11,7 +11,7 @@ from sqlalchemy import delete as sql_delete
 from sqlalchemy.dialects.postgresql import insert
 from sqlalchemy.exc import NoResultFound
 from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import DeclarativeBase, QueryableAttribute, selectinload
 from sqlalchemy.sql.roles import WhereHavingRole
 
 from ..db import get_transaction
@@ -21,6 +21,7 @@ from .search import SearchConfig, SearchFieldType, build_search_filters
 
 ModelType = TypeVar("ModelType", bound=DeclarativeBase)
 JoinType = list[tuple[type[DeclarativeBase], Any]]
+M2MFieldType = Mapping[str, QueryableAttribute[Any]]
 
 
 class AsyncCrud(Generic[ModelType]):
@@ -31,6 +32,7 @@ class AsyncCrud(Generic[ModelType]):
 
     model: ClassVar[type[DeclarativeBase]]
     searchable_fields: ClassVar[Sequence[SearchFieldType] | None] = None
+    m2m_fields: ClassVar[M2MFieldType | None] = None
 
     @overload
     @classmethod
@@ -52,6 +54,62 @@ class AsyncCrud(Generic[ModelType]):
         as_response: Literal[False] = ...,
     ) -> ModelType: ...
 
+    @classmethod
+    async def _resolve_m2m(
+        cls: type[Self],
+        session: AsyncSession,
+        obj: BaseModel,
+        *,
+        only_set: bool = False,
+    ) -> dict[str, list[Any]]:
+        """Resolve M2M fields from a Pydantic schema into related model instances.
+
+        Args:
+            session: DB async session
+            obj: Pydantic model containing M2M ID fields
+            only_set: If True, only process fields explicitly set on the schema
+
+        Returns:
+            Dict mapping relationship attr names to lists of related instances
+        """
+        result: dict[str, list[Any]] = {}
+        if not cls.m2m_fields:
+            return result
+
+        for schema_field, rel in cls.m2m_fields.items():
+            rel_attr = rel.property.key
+            related_model = rel.property.mapper.class_
+            if only_set and schema_field not in obj.model_fields_set:
+                continue
+            ids = getattr(obj, schema_field, None)
+            if ids is not None:
+                related = (
+                    (
+                        await session.execute(
+                            select(related_model).where(related_model.id.in_(ids))
+                        )
+                    )
+                    .scalars()
+                    .all()
+                )
+                if len(related) != len(ids):
+                    found_ids = {r.id for r in related}
+                    missing = set(ids) - found_ids
+                    raise NotFoundError(
+                        f"Related {related_model.__name__} not found for IDs: {missing}"
+                    )
+                result[rel_attr] = list(related)
+            else:
+                result[rel_attr] = []
+        return result
+
+    @classmethod
+    def _m2m_schema_fields(cls: type[Self]) -> set[str]:
+        """Return the set of schema field names that are M2M fields."""
+        if not cls.m2m_fields:
+            return set()
+        return set(cls.m2m_fields.keys())
+
     @classmethod
     async def create(
         cls: type[Self],
@@ -71,7 +129,17 @@ class AsyncCrud(Generic[ModelType]):
             Created model instance or Response wrapping it
         """
         async with get_transaction(session):
-            db_model = cls.model(**obj.model_dump())
+            m2m_exclude = cls._m2m_schema_fields()
+            data = (
+                obj.model_dump(exclude=m2m_exclude) if m2m_exclude else obj.model_dump()
+            )
+            db_model = cls.model(**data)
+
+            if m2m_exclude:
+                m2m_resolved = await cls._resolve_m2m(session, obj)
+                for rel_attr, related_instances in m2m_resolved.items():
+                    setattr(db_model, rel_attr, related_instances)
+
             session.add(db_model)
         await session.refresh(db_model)
         result = cast(ModelType, db_model)
@@ -299,12 +367,33 @@ class AsyncCrud(Generic[ModelType]):
             NotFoundError: If no record found
         """
         async with get_transaction(session):
-            db_model = await cls.get(session=session, filters=filters)
+            m2m_exclude = cls._m2m_schema_fields()
+
+            # Eagerly load M2M relationships that will be updated so that
+            # setattr does not trigger a lazy load (which fails in async).
+            m2m_load_options: list[Any] = []
+            if m2m_exclude and cls.m2m_fields:
+                for schema_field, rel in cls.m2m_fields.items():
+                    if schema_field in obj.model_fields_set:
+                        m2m_load_options.append(selectinload(rel))
+
+            db_model = await cls.get(
+                session=session,
+                filters=filters,
+                load_options=m2m_load_options or None,
+            )
             values = obj.model_dump(
-                exclude_unset=exclude_unset, exclude_none=exclude_none
+                exclude_unset=exclude_unset,
+                exclude_none=exclude_none,
+                exclude=m2m_exclude,
             )
             for key, value in values.items():
                 setattr(db_model, key, value)
+
+            if m2m_exclude:
+                m2m_resolved = await cls._resolve_m2m(session, obj, only_set=True)
+                for rel_attr, related_instances in m2m_resolved.items():
+                    setattr(db_model, rel_attr, related_instances)
         await session.refresh(db_model)
         if as_response:
             return Response(data=db_model)
@@ -578,12 +667,16 @@ def CrudFactory(
     model: type[ModelType],
     *,
     searchable_fields: Sequence[SearchFieldType] | None = None,
+    m2m_fields: M2MFieldType | None = None,
 ) -> type[AsyncCrud[ModelType]]:
     """Create a CRUD class for a specific model.
 
     Args:
         model: SQLAlchemy model class
         searchable_fields: Optional list of searchable fields
+        m2m_fields: Optional mapping for many-to-many relationships.
+            Maps schema field names (containing lists of IDs) to
+            SQLAlchemy relationship attributes.
 
     Returns:
         AsyncCrud subclass bound to the model
@@ -601,10 +694,20 @@ def CrudFactory(
             searchable_fields=[User.username, User.email, (User.role, Role.name)]
         )
 
+        # With many-to-many fields:
+        # Schema has `tag_ids: list[UUID]`, model has `tags` relationship to Tag
+        PostCrud = CrudFactory(
+            Post,
+            m2m_fields={"tag_ids": Post.tags},
+        )
+
         # Usage
         user = await UserCrud.get(session, [User.id == 1])
         posts = await PostCrud.get_multi(session, filters=[Post.user_id == user.id])
 
+        # Create with M2M - tag_ids are automatically resolved
+        post = await PostCrud.create(session, PostCreate(title="Hello", tag_ids=[id1, id2]))
+
         # With search
         result = await UserCrud.paginate(session, search="john")
 
@@ -628,6 +731,7 @@ def CrudFactory(
         {
             "model": model,
             "searchable_fields": searchable_fields,
+            "m2m_fields": m2m_fields,
         },
     )
     return cast(type[AsyncCrud[ModelType]], cls)

src/fastapi_toolsets/dependencies.py

@@ -8,7 +8,9 @@ from fastapi import Depends
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import DeclarativeBase
 
-from ..crud import CrudFactory
+from .crud import CrudFactory
+
+__all__ = ["BodyDependency", "PathDependency"]
 
 ModelType = TypeVar("ModelType", bound=DeclarativeBase)
 SessionDependency = Callable[[], AsyncGenerator[AsyncSession, None]]

src/fastapi_toolsets/dependencies/__init__.py

@@ -1,5 +0,0 @@
-"""FastAPI dependency factories for database objects."""
-
-from .factory import BodyDependency, PathDependency
-
-__all__ = ["BodyDependency", "PathDependency"]

src/fastapi_toolsets/exceptions/exceptions.py

@@ -76,55 +76,6 @@ class ConflictError(ApiException):
     )
 
 
-class InsufficientRolesError(ForbiddenError):
-    """User does not have the required roles."""
-
-    api_error = ApiError(
-        code=403,
-        msg="Insufficient Roles",
-        desc="You do not have the required roles to access this resource.",
-        err_code="RBAC-403",
-    )
-
-    def __init__(self, required_roles: list[str], user_roles: set[str] | None = None):
-        """Initialize the exception.
-
-        Args:
-            required_roles: Roles needed to access the resource
-            user_roles: Roles the current user has, if known
-        """
-        self.required_roles = required_roles
-        self.user_roles = user_roles
-
-        desc = f"Required roles: {', '.join(required_roles)}"
-        if user_roles is not None:
-            desc += f". User has: {', '.join(user_roles) if user_roles else 'no roles'}"
-
-        super().__init__(desc)
-
-
-class UserNotFoundError(NotFoundError):
-    """User was not found."""
-
-    api_error = ApiError(
-        code=404,
-        msg="User Not Found",
-        desc="The requested user was not found.",
-        err_code="USER-404",
-    )
-
-
-class RoleNotFoundError(NotFoundError):
-    """Role was not found."""
-
-    api_error = ApiError(
-        code=404,
-        msg="Role Not Found",
-        desc="The requested role was not found.",
-        err_code="ROLE-404",
-    )
-
-
 class NoSearchableFieldsError(ApiException):
     """Raised when search is requested but no searchable fields are available."""
 

src/fastapi_toolsets/metrics/__init__.py

@@ -0,0 +1,21 @@
+"""Prometheus metrics integration for FastAPI applications."""
+
+from typing import Any
+
+from .registry import Metric, MetricsRegistry
+
+try:
+    from .handler import init_metrics
+except ImportError:
+
+    def init_metrics(*_args: Any, **_kwargs: Any) -> None:
+        from .._imports import require_extra
+
+        require_extra(package="prometheus_client", extra="metrics")
+
+
+__all__ = [
+    "Metric",
+    "MetricsRegistry",
+    "init_metrics",
+]

src/fastapi_toolsets/metrics/handler.py

@@ -0,0 +1,73 @@
+"""Prometheus metrics endpoint for FastAPI applications."""
+
+import asyncio
+import os
+
+from fastapi import FastAPI
+from fastapi.responses import Response
+from prometheus_client import (
+    CONTENT_TYPE_LATEST,
+    CollectorRegistry,
+    generate_latest,
+    multiprocess,
+)
+
+from ..logger import get_logger
+from .registry import MetricsRegistry
+
+logger = get_logger()
+
+
+def _is_multiprocess() -> bool:
+    """Check if prometheus multi-process mode is enabled."""
+    return "PROMETHEUS_MULTIPROC_DIR" in os.environ
+
+
+def init_metrics(
+    app: FastAPI,
+    registry: MetricsRegistry,
+    *,
+    path: str = "/metrics",
+) -> FastAPI:
+    """Register a Prometheus ``/metrics`` endpoint on a FastAPI app.
+
+    Args:
+        app: FastAPI application instance.
+        registry: A :class:`MetricsRegistry` containing providers and collectors.
+        path: URL path for the metrics endpoint (default ``/metrics``).
+
+    Returns:
+        The same FastAPI instance (for chaining).
+
+    Example:
+        from fastapi import FastAPI
+        from fastapi_toolsets.metrics import MetricsRegistry, init_metrics
+
+        metrics = MetricsRegistry()
+        app = FastAPI()
+        init_metrics(app, registry=metrics)
+    """
+    for provider in registry.get_providers():
+        logger.debug("Initialising metric provider '%s'", provider.name)
+        provider.func()
+
+    collectors = registry.get_collectors()
+
+    @app.get(path, include_in_schema=False)
+    async def metrics_endpoint() -> Response:
+        for collector in collectors:
+            if asyncio.iscoroutinefunction(collector.func):
+                await collector.func()
+            else:
+                collector.func()
+
+        if _is_multiprocess():
+            prom_registry = CollectorRegistry()
+            multiprocess.MultiProcessCollector(prom_registry)
+            output = generate_latest(prom_registry)
+        else:
+            output = generate_latest()
+
+        return Response(content=output, media_type=CONTENT_TYPE_LATEST)
+
+    return app

src/fastapi_toolsets/metrics/registry.py

@@ -0,0 +1,122 @@
+"""Metrics registry with decorator-based registration."""
+
+from collections.abc import Callable
+from dataclasses import dataclass, field
+from typing import Any, cast
+
+from ..logger import get_logger
+
+logger = get_logger()
+
+
+@dataclass
+class Metric:
+    """A metric definition with metadata."""
+
+    name: str
+    func: Callable[..., Any]
+    collect: bool = field(default=False)
+
+
+class MetricsRegistry:
+    """Registry for managing Prometheus metric providers and collectors.
+
+    Example:
+        from prometheus_client import Counter, Gauge
+        from fastapi_toolsets.metrics import MetricsRegistry
+
+        metrics = MetricsRegistry()
+
+        @metrics.register
+        def http_requests():
+            return Counter("http_requests_total", "Total HTTP requests", ["method", "status"])
+
+        @metrics.register(name="db_pool")
+        def database_pool_size():
+            return Gauge("db_pool_size", "Database connection pool size")
+
+        @metrics.register(collect=True)
+        def collect_queue_depth(gauge=Gauge("queue_depth", "Current queue depth")):
+            gauge.set(get_current_queue_depth())
+    """
+
+    def __init__(self) -> None:
+        self._metrics: dict[str, Metric] = {}
+
+    def register(
+        self,
+        func: Callable[..., Any] | None = None,
+        *,
+        name: str | None = None,
+        collect: bool = False,
+    ) -> Callable[..., Any]:
+        """Register a metric provider or collector function.
+
+        Can be used as a decorator with or without arguments.
+
+        Args:
+            func: The metric function to register.
+            name: Metric name (defaults to function name).
+            collect: If ``True``, the function is called on every scrape.
+                If ``False`` (default), called once at init time.
+
+        Example:
+            @metrics.register
+            def my_counter():
+                return Counter("my_counter", "A counter")
+
+            @metrics.register(collect=True, name="queue")
+            def collect_queue_depth():
+                gauge.set(compute_depth())
+        """
+
+        def decorator(fn: Callable[..., Any]) -> Callable[..., Any]:
+            metric_name = name or cast(Any, fn).__name__
+            self._metrics[metric_name] = Metric(
+                name=metric_name,
+                func=fn,
+                collect=collect,
+            )
+            return fn
+
+        if func is not None:
+            return decorator(func)
+        return decorator
+
+    def include_registry(self, registry: "MetricsRegistry") -> None:
+        """Include another :class:`MetricsRegistry` into this one.
+
+        Args:
+            registry: The registry to merge in.
+
+        Raises:
+            ValueError: If a metric name already exists in the current registry.
+
+        Example:
+            main = MetricsRegistry()
+            sub = MetricsRegistry()
+
+            @sub.register
+            def sub_metric():
+                return Counter("sub_total", "Sub counter")
+
+            main.include_registry(sub)
+        """
+        for metric_name, definition in registry._metrics.items():
+            if metric_name in self._metrics:
+                raise ValueError(
+                    f"Metric '{metric_name}' already exists in the current registry"
+                )
+            self._metrics[metric_name] = definition
+
+    def get_all(self) -> list[Metric]:
+        """Get all registered metric definitions."""
+        return list(self._metrics.values())
+
+    def get_providers(self) -> list[Metric]:
+        """Get metric providers (called once at init)."""
+        return [m for m in self._metrics.values() if not m.collect]
+
+    def get_collectors(self) -> list[Metric]:
+        """Get collectors (called on each scrape)."""
+        return [m for m in self._metrics.values() if m.collect]

src/fastapi_toolsets/pytest/__init__.py

@@ -1,13 +1,24 @@
 """Pytest helpers for FastAPI testing: sessions, clients, and fixtures."""
 
-from .plugin import register_fixtures
-from .utils import (
-    cleanup_tables,
-    create_async_client,
-    create_db_session,
-    create_worker_database,
-    worker_database_url,
-)
+try:
+    from .plugin import register_fixtures
+except ImportError:
+    from .._imports import require_extra
+
+    require_extra(package="pytest", extra="pytest")
+
+try:
+    from .utils import (
+        cleanup_tables,
+        create_async_client,
+        create_db_session,
+        create_worker_database,
+        worker_database_url,
+    )
+except ImportError:
+    from .._imports import require_extra
+
+    require_extra(package="httpx", extra="pytest")
 
 __all__ = [
     "cleanup_tables",

src/fastapi_toolsets/pytest/plugin.py

@@ -1,55 +1,4 @@
-"""Pytest plugin for using FixtureRegistry fixtures in tests.
-
-This module provides utilities to automatically generate pytest fixtures
-from your FixtureRegistry, with proper dependency resolution.
-
-Example:
-    # conftest.py
-    import pytest
-    from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
-
-    from app.fixtures import fixtures  # Your FixtureRegistry
-    from app.models import Base
-    from fastapi_toolsets.pytest_plugin import register_fixtures
-
-    DATABASE_URL = "postgresql+asyncpg://postgres:postgres@localhost:5432/test_db"
-
-    @pytest.fixture
-    async def engine():
-        engine = create_async_engine(DATABASE_URL)
-        yield engine
-        await engine.dispose()
-
-    @pytest.fixture
-    async def db_session(engine):
-        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)
-
-    # Automatically generate pytest fixtures from registry
-    # Creates: fixture_roles, fixture_users, fixture_posts, etc.
-    register_fixtures(fixtures, globals())
-
-Usage in tests:
-    # test_users.py
-    async def test_user_count(db_session, fixture_users):
-        # fixture_users automatically loads fixture_roles first (if dependency)
-        # and returns the list of User models
-        assert len(fixture_users) > 0
-
-    async def test_user_role(db_session, fixture_users):
-        user = fixture_users[0]
-        assert user.role_id is not None
-"""
+"""Pytest plugin for using FixtureRegistry fixtures in tests."""
 
 from collections.abc import Callable, Sequence
 from typing import Any

tests/conftest.py

@@ -5,24 +5,18 @@ import uuid
 
 import pytest
 from pydantic import BaseModel
-from sqlalchemy import ForeignKey, String, Uuid
+from sqlalchemy import Column, ForeignKey, String, Table, Uuid
 from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
 from fastapi_toolsets.crud import CrudFactory
 
-# PostgreSQL connection URL from environment or default for local development
-DATABASE_URL = os.getenv("DATABASE_URL") or os.getenv(
-    "TEST_DATABASE_URL",
-    "postgresql+asyncpg://postgres:postgres@localhost:5432/fastapi_toolsets_test",
+DATABASE_URL = os.getenv(
+    key="DATABASE_URL",
+    default="postgresql+asyncpg://postgres:postgres@localhost:5432/postgres",
 )
 
 
-# =============================================================================
-# Test Models
-# =============================================================================
-
-
 class Base(DeclarativeBase):
     """Base class for test models."""
 
@@ -56,6 +50,25 @@ class User(Base):
     role: Mapped[Role | None] = relationship(back_populates="users")
 
 
+class Tag(Base):
+    """Test tag model."""
+
+    __tablename__ = "tags"
+
+    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
+    name: Mapped[str] = mapped_column(String(50), unique=True)
+
+
+post_tags = Table(
+    "post_tags",
+    Base.metadata,
+    Column(
+        "post_id", Uuid, ForeignKey("posts.id", ondelete="CASCADE"), primary_key=True
+    ),
+    Column("tag_id", Uuid, ForeignKey("tags.id", ondelete="CASCADE"), primary_key=True),
+)
+
+
 class Post(Base):
     """Test post model."""
 
@@ -67,10 +80,7 @@ class Post(Base):
     is_published: Mapped[bool] = mapped_column(default=False)
     author_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("users.id"))
 
-
-# =============================================================================
-# Test Schemas
-# =============================================================================
+    tags: Mapped[list[Tag]] = relationship(secondary=post_tags)
 
 
 class RoleCreate(BaseModel):
@@ -105,6 +115,13 @@ class UserUpdate(BaseModel):
     role_id: uuid.UUID | None = None
 
 
+class TagCreate(BaseModel):
+    """Schema for creating a tag."""
+
+    id: uuid.UUID | None = None
+    name: str
+
+
 class PostCreate(BaseModel):
     """Schema for creating a post."""
 
@@ -123,18 +140,31 @@ class PostUpdate(BaseModel):
     is_published: bool | None = None
 
 
-# =============================================================================
-# CRUD Classes
-# =============================================================================
+class PostM2MCreate(BaseModel):
+    """Schema for creating a post with M2M tag IDs."""
+
+    id: uuid.UUID | None = None
+    title: str
+    content: str = ""
+    is_published: bool = False
+    author_id: uuid.UUID
+    tag_ids: list[uuid.UUID] = []
+
+
+class PostM2MUpdate(BaseModel):
+    """Schema for updating a post with M2M tag IDs."""
+
+    title: str | None = None
+    content: str | None = None
+    is_published: bool | None = None
+    tag_ids: list[uuid.UUID] | None = None
+
 
 RoleCrud = CrudFactory(Role)
 UserCrud = CrudFactory(User)
 PostCrud = CrudFactory(Post)
-
-
-# =============================================================================
-# Fixtures
-# =============================================================================
+TagCrud = CrudFactory(Tag)
+PostM2MCrud = CrudFactory(Post, m2m_fields={"tag_ids": Post.tags})
 
 
 @pytest.fixture

tests/test_crud.py

@@ -4,6 +4,7 @@ import uuid
 
 import pytest
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
 
 from fastapi_toolsets.crud import CrudFactory
 from fastapi_toolsets.crud.factory import AsyncCrud
@@ -13,10 +14,15 @@ from .conftest import (
     Post,
     PostCreate,
     PostCrud,
+    PostM2MCreate,
+    PostM2MCrud,
+    PostM2MUpdate,
     Role,
     RoleCreate,
     RoleCrud,
     RoleUpdate,
+    TagCreate,
+    TagCrud,
     User,
     UserCreate,
     UserCrud,
@@ -812,3 +818,383 @@ class TestAsResponse:
 
         assert isinstance(result, Response)
         assert result.data is None
+
+
+class TestCrudFactoryM2M:
+    """Tests for CrudFactory with m2m_fields parameter."""
+
+    def test_creates_crud_with_m2m_fields(self):
+        """CrudFactory configures m2m_fields on the class."""
+        crud = CrudFactory(Post, m2m_fields={"tag_ids": Post.tags})
+        assert crud.m2m_fields is not None
+        assert "tag_ids" in crud.m2m_fields
+
+    def test_creates_crud_without_m2m_fields(self):
+        """CrudFactory without m2m_fields has None."""
+        crud = CrudFactory(Post)
+        assert crud.m2m_fields is None
+
+    def test_m2m_schema_fields(self):
+        """_m2m_schema_fields returns correct field names."""
+        crud = CrudFactory(Post, m2m_fields={"tag_ids": Post.tags})
+        assert crud._m2m_schema_fields() == {"tag_ids"}
+
+    def test_m2m_schema_fields_empty_when_none(self):
+        """_m2m_schema_fields returns empty set when no m2m_fields."""
+        crud = CrudFactory(Post)
+        assert crud._m2m_schema_fields() == set()
+
+    @pytest.mark.anyio
+    async def test_resolve_m2m_returns_empty_without_m2m_fields(
+        self, db_session: AsyncSession
+    ):
+        """_resolve_m2m returns empty dict when m2m_fields is not configured."""
+        from pydantic import BaseModel
+
+        class DummySchema(BaseModel):
+            name: str
+
+        result = await PostCrud._resolve_m2m(db_session, DummySchema(name="test"))
+        assert result == {}
+
+
+class TestM2MResolveNone:
+    """Tests for _resolve_m2m when IDs field is None."""
+
+    @pytest.mark.anyio
+    async def test_resolve_m2m_with_none_ids(self, db_session: AsyncSession):
+        """_resolve_m2m sets empty list when ids value is None."""
+        from pydantic import BaseModel
+
+        class SchemaWithNullableTags(BaseModel):
+            tag_ids: list[uuid.UUID] | None = None
+
+        result = await PostM2MCrud._resolve_m2m(
+            db_session, SchemaWithNullableTags(tag_ids=None)
+        )
+        assert result == {"tags": []}
+
+
+class TestM2MCreate:
+    """Tests for create with M2M relationships."""
+
+    @pytest.mark.anyio
+    async def test_create_with_m2m_tags(self, db_session: AsyncSession):
+        """Create a post with M2M tags resolves tag IDs."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag1 = await TagCrud.create(db_session, TagCreate(name="python"))
+        tag2 = await TagCrud.create(db_session, TagCreate(name="fastapi"))
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="M2M Post",
+                author_id=user.id,
+                tag_ids=[tag1.id, tag2.id],
+            ),
+        )
+
+        assert post.id is not None
+        assert post.title == "M2M Post"
+
+        # Reload with tags eagerly loaded
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        tag_names = sorted(t.name for t in loaded.tags)
+        assert tag_names == ["fastapi", "python"]
+
+    @pytest.mark.anyio
+    async def test_create_with_empty_m2m(self, db_session: AsyncSession):
+        """Create a post with empty tag_ids list works."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="No Tags Post",
+                author_id=user.id,
+                tag_ids=[],
+            ),
+        )
+
+        assert post.id is not None
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert loaded.tags == []
+
+    @pytest.mark.anyio
+    async def test_create_with_default_m2m(self, db_session: AsyncSession):
+        """Create a post using default tag_ids (empty list) works."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(title="Default Tags", author_id=user.id),
+        )
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert loaded.tags == []
+
+    @pytest.mark.anyio
+    async def test_create_with_nonexistent_tag_id_raises(
+        self, db_session: AsyncSession
+    ):
+        """Create with a nonexistent tag ID raises NotFoundError."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag = await TagCrud.create(db_session, TagCreate(name="valid"))
+        fake_id = uuid.uuid4()
+
+        with pytest.raises(NotFoundError):
+            await PostM2MCrud.create(
+                db_session,
+                PostM2MCreate(
+                    title="Bad Tags",
+                    author_id=user.id,
+                    tag_ids=[tag.id, fake_id],
+                ),
+            )
+
+    @pytest.mark.anyio
+    async def test_create_with_single_tag(self, db_session: AsyncSession):
+        """Create with a single tag works correctly."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag = await TagCrud.create(db_session, TagCreate(name="solo"))
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="Single Tag",
+                author_id=user.id,
+                tag_ids=[tag.id],
+            ),
+        )
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert len(loaded.tags) == 1
+        assert loaded.tags[0].name == "solo"
+
+
+class TestM2MUpdate:
+    """Tests for update with M2M relationships."""
+
+    @pytest.mark.anyio
+    async def test_update_m2m_tags(self, db_session: AsyncSession):
+        """Update replaces M2M tags when tag_ids is set."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag1 = await TagCrud.create(db_session, TagCreate(name="old_tag"))
+        tag2 = await TagCrud.create(db_session, TagCreate(name="new_tag"))
+
+        # Create with tag1
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="Update Test",
+                author_id=user.id,
+                tag_ids=[tag1.id],
+            ),
+        )
+
+        # Update to tag2
+        updated = await PostM2MCrud.update(
+            db_session,
+            PostM2MUpdate(tag_ids=[tag2.id]),
+            [Post.id == post.id],
+        )
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == updated.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert len(loaded.tags) == 1
+        assert loaded.tags[0].name == "new_tag"
+
+    @pytest.mark.anyio
+    async def test_update_without_m2m_preserves_tags(self, db_session: AsyncSession):
+        """Update without setting tag_ids preserves existing tags."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag = await TagCrud.create(db_session, TagCreate(name="keep_me"))
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="Keep Tags",
+                author_id=user.id,
+                tag_ids=[tag.id],
+            ),
+        )
+
+        # Update only title, tag_ids not set
+        await PostM2MCrud.update(
+            db_session,
+            PostM2MUpdate(title="Updated Title"),
+            [Post.id == post.id],
+        )
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert loaded.title == "Updated Title"
+        assert len(loaded.tags) == 1
+        assert loaded.tags[0].name == "keep_me"
+
+    @pytest.mark.anyio
+    async def test_update_clear_m2m_tags(self, db_session: AsyncSession):
+        """Update with empty tag_ids clears all tags."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag = await TagCrud.create(db_session, TagCreate(name="remove_me"))
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="Clear Tags",
+                author_id=user.id,
+                tag_ids=[tag.id],
+            ),
+        )
+
+        # Explicitly set tag_ids to empty list
+        await PostM2MCrud.update(
+            db_session,
+            PostM2MUpdate(tag_ids=[]),
+            [Post.id == post.id],
+        )
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert loaded.tags == []
+
+    @pytest.mark.anyio
+    async def test_update_m2m_with_nonexistent_id_raises(
+        self, db_session: AsyncSession
+    ):
+        """Update with nonexistent tag ID raises NotFoundError."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag = await TagCrud.create(db_session, TagCreate(name="existing"))
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="Bad Update",
+                author_id=user.id,
+                tag_ids=[tag.id],
+            ),
+        )
+
+        fake_id = uuid.uuid4()
+        with pytest.raises(NotFoundError):
+            await PostM2MCrud.update(
+                db_session,
+                PostM2MUpdate(tag_ids=[fake_id]),
+                [Post.id == post.id],
+            )
+
+    @pytest.mark.anyio
+    async def test_update_m2m_and_scalar_fields(self, db_session: AsyncSession):
+        """Update both scalar fields and M2M tags together."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        tag1 = await TagCrud.create(db_session, TagCreate(name="tag1"))
+        tag2 = await TagCrud.create(db_session, TagCreate(name="tag2"))
+
+        post = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(
+                title="Original",
+                author_id=user.id,
+                tag_ids=[tag1.id],
+            ),
+        )
+
+        # Update title and tags simultaneously
+        await PostM2MCrud.update(
+            db_session,
+            PostM2MUpdate(title="Updated", tag_ids=[tag1.id, tag2.id]),
+            [Post.id == post.id],
+        )
+
+        loaded = await PostM2MCrud.get(
+            db_session,
+            [Post.id == post.id],
+            load_options=[selectinload(Post.tags)],
+        )
+        assert loaded.title == "Updated"
+        tag_names = sorted(t.name for t in loaded.tags)
+        assert tag_names == ["tag1", "tag2"]
+
+
+class TestM2MWithNonM2MCrud:
+    """Tests that non-M2M CRUD classes are unaffected."""
+
+    @pytest.mark.anyio
+    async def test_create_without_m2m_unchanged(self, db_session: AsyncSession):
+        """Regular PostCrud.create still works without M2M logic."""
+        from .conftest import PostCreate
+
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        post = await PostCrud.create(
+            db_session,
+            PostCreate(title="Plain Post", author_id=user.id),
+        )
+        assert post.id is not None
+        assert post.title == "Plain Post"
+
+    @pytest.mark.anyio
+    async def test_update_without_m2m_unchanged(self, db_session: AsyncSession):
+        """Regular PostCrud.update still works without M2M logic."""
+        from .conftest import PostCreate, PostUpdate
+
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author", email="author@test.com")
+        )
+        post = await PostCrud.create(
+            db_session,
+            PostCreate(title="Plain Post", author_id=user.id),
+        )
+        updated = await PostCrud.update(
+            db_session,
+            PostUpdate(title="Updated Plain"),
+            [Post.id == post.id],
+        )
+        assert updated.title == "Updated Plain"

tests/test_imports.py

@@ -0,0 +1,229 @@
+"""Tests for optional dependency import guards."""
+
+import importlib
+import sys
+from unittest.mock import patch
+
+import pytest
+
+from fastapi_toolsets._imports import require_extra
+
+
+class TestRequireExtra:
+    """Tests for the require_extra helper."""
+
+    def test_raises_import_error(self):
+        """require_extra raises ImportError."""
+        with pytest.raises(ImportError):
+            require_extra(package="some_pkg", extra="some_extra")
+
+    def test_error_message_contains_package_name(self):
+        """Error message mentions the missing package."""
+        with pytest.raises(ImportError, match="'prometheus_client'"):
+            require_extra(package="prometheus_client", extra="metrics")
+
+    def test_error_message_contains_install_instruction(self):
+        """Error message contains the pip install command."""
+        with pytest.raises(
+            ImportError, match=r"pip install fastapi-toolsets\[metrics\]"
+        ):
+            require_extra(package="prometheus_client", extra="metrics")
+
+
+def _reload_without_package(module_path: str, blocked_packages: list[str]):
+    """Reload a module while blocking specific package imports.
+
+    Removes the target module and its parents from sys.modules so they
+    get re-imported, and patches builtins.__import__ to raise ImportError
+    for *blocked_packages*.
+    """
+    # Remove cached modules so they get re-imported
+    to_remove = [
+        key
+        for key in sys.modules
+        if key == module_path or key.startswith(module_path + ".")
+    ]
+    saved = {}
+    for key in to_remove:
+        saved[key] = sys.modules.pop(key)
+
+    # Also remove parent package to force re-execution of __init__.py
+    parts = module_path.rsplit(".", 1)
+    if len(parts) == 2:
+        parent = parts[0]
+        parent_keys = [
+            key for key in sys.modules if key == parent or key.startswith(parent + ".")
+        ]
+        for key in parent_keys:
+            if key not in saved:
+                saved[key] = sys.modules.pop(key)
+
+    original_import = (
+        __builtins__.__import__ if hasattr(__builtins__, "__import__") else __import__
+    )
+
+    def blocking_import(name, *args, **kwargs):
+        for blocked in blocked_packages:
+            if name == blocked or name.startswith(blocked + "."):
+                raise ImportError(f"Mocked: No module named '{name}'")
+        return original_import(name, *args, **kwargs)
+
+    return saved, blocking_import
+
+
+class TestMetricsImportGuard:
+    """Tests for metrics module import guard when prometheus_client is missing."""
+
+    def test_registry_imports_without_prometheus(self):
+        """Metric and MetricsRegistry are importable without prometheus_client."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.metrics", ["prometheus_client"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                mod = importlib.import_module("fastapi_toolsets.metrics")
+                # Registry types should be available (they're stdlib-only)
+                assert hasattr(mod, "Metric")
+                assert hasattr(mod, "MetricsRegistry")
+        finally:
+            # Restore original modules
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.metrics"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_init_metrics_stub_raises_without_prometheus(self):
+        """init_metrics raises ImportError when prometheus_client is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.metrics", ["prometheus_client"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                mod = importlib.import_module("fastapi_toolsets.metrics")
+                with pytest.raises(ImportError, match="prometheus_client"):
+                    mod.init_metrics(None, None)  # type: ignore[arg-type]
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.metrics"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_init_metrics_works_with_prometheus(self):
+        """init_metrics is the real function when prometheus_client is available."""
+        from fastapi_toolsets.metrics import init_metrics
+
+        # Should be the real function, not a stub
+        assert init_metrics.__module__ == "fastapi_toolsets.metrics.handler"
+
+
+class TestPytestImportGuard:
+    """Tests for pytest module import guard when dependencies are missing."""
+
+    def test_import_raises_without_pytest_package(self):
+        """Importing fastapi_toolsets.pytest raises when pytest is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.pytest", ["pytest"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(ImportError, match="pytest"):
+                    importlib.import_module("fastapi_toolsets.pytest")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.pytest"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_import_raises_without_httpx(self):
+        """Importing fastapi_toolsets.pytest raises when httpx is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.pytest", ["httpx"]
+        )
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(ImportError, match="httpx"):
+                    importlib.import_module("fastapi_toolsets.pytest")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.pytest"):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_all_exports_available_with_deps(self):
+        """All expected exports are available when deps are installed."""
+        from fastapi_toolsets.pytest import (
+            cleanup_tables,
+            create_async_client,
+            create_db_session,
+            create_worker_database,
+            register_fixtures,
+            worker_database_url,
+        )
+
+        assert callable(register_fixtures)
+        assert callable(create_async_client)
+        assert callable(create_db_session)
+        assert callable(create_worker_database)
+        assert callable(worker_database_url)
+        assert callable(cleanup_tables)
+
+
+class TestCliImportGuard:
+    """Tests for CLI module import guard when typer is missing."""
+
+    def test_import_raises_without_typer(self):
+        """Importing cli.app raises when typer is missing."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.cli.app", ["typer"]
+        )
+        # Also remove cli.config since it imports typer too
+        config_keys = [
+            k for k in sys.modules if k.startswith("fastapi_toolsets.cli.config")
+        ]
+        for key in config_keys:
+            if key not in saved:
+                saved[key] = sys.modules.pop(key)
+
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(ImportError, match="typer"):
+                    importlib.import_module("fastapi_toolsets.cli.app")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
+                    "fastapi_toolsets.cli.config"
+                ):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_error_message_suggests_cli_extra(self):
+        """Error message suggests installing the cli extra."""
+        saved, blocking_import = _reload_without_package(
+            "fastapi_toolsets.cli.app", ["typer"]
+        )
+        config_keys = [
+            k for k in sys.modules if k.startswith("fastapi_toolsets.cli.config")
+        ]
+        for key in config_keys:
+            if key not in saved:
+                saved[key] = sys.modules.pop(key)
+
+        try:
+            with patch("builtins.__import__", side_effect=blocking_import):
+                with pytest.raises(
+                    ImportError, match=r"pip install fastapi-toolsets\[cli\]"
+                ):
+                    importlib.import_module("fastapi_toolsets.cli.app")
+        finally:
+            for key in list(sys.modules):
+                if key.startswith("fastapi_toolsets.cli.app") or key.startswith(
+                    "fastapi_toolsets.cli.config"
+                ):
+                    sys.modules.pop(key, None)
+            sys.modules.update(saved)
+
+    def test_async_command_imports_without_typer(self):
+        """async_command is importable without typer (stdlib only)."""
+        from fastapi_toolsets.cli import async_command
+
+        assert callable(async_command)

tests/test_metrics.py

@@ -0,0 +1,519 @@
+"""Tests for fastapi_toolsets.metrics module."""
+
+import os
+import tempfile
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+from prometheus_client import REGISTRY, CollectorRegistry, Counter, Gauge
+
+from fastapi_toolsets.metrics import Metric, MetricsRegistry, init_metrics
+
+
+@pytest.fixture(autouse=True)
+def _clean_prometheus_registry():
+    """Unregister test collectors from the global registry after each test."""
+    yield
+    collectors = list(REGISTRY._names_to_collectors.values())
+    for collector in collectors:
+        try:
+            REGISTRY.unregister(collector)
+        except Exception:
+            pass
+
+
+class TestMetric:
+    """Tests for Metric dataclass."""
+
+    def test_default_collect_is_false(self):
+        """Default collect is False (provider mode)."""
+        definition = Metric(name="test", func=lambda: None)
+        assert definition.collect is False
+
+    def test_collect_true(self):
+        """Collect can be set to True (collector mode)."""
+        definition = Metric(name="test", func=lambda: None, collect=True)
+        assert definition.collect is True
+
+
+class TestMetricsRegistry:
+    """Tests for MetricsRegistry class."""
+
+    def test_register_with_decorator(self):
+        """Register metric with bare decorator."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def my_counter():
+            return Counter("test_counter", "A test counter")
+
+        names = [m.name for m in registry.get_all()]
+        assert "my_counter" in names
+
+    def test_register_with_custom_name(self):
+        """Register metric with custom name."""
+        registry = MetricsRegistry()
+
+        @registry.register(name="custom_name")
+        def my_counter():
+            return Counter("test_counter_2", "A test counter")
+
+        definition = registry.get_all()[0]
+        assert definition.name == "custom_name"
+
+    def test_register_as_collector(self):
+        """Register metric with collect=True."""
+        registry = MetricsRegistry()
+
+        @registry.register(collect=True)
+        def collect_something():
+            pass
+
+        definition = registry.get_all()[0]
+        assert definition.collect is True
+
+    def test_register_preserves_function(self):
+        """Decorator returns the original function unchanged."""
+        registry = MetricsRegistry()
+
+        def my_func():
+            return "original"
+
+        result = registry.register(my_func)
+        assert result is my_func
+        assert result() == "original"
+
+    def test_register_parameterized_preserves_function(self):
+        """Parameterized decorator returns the original function unchanged."""
+        registry = MetricsRegistry()
+
+        def my_func():
+            return "original"
+
+        result = registry.register(name="custom")(my_func)
+        assert result is my_func
+        assert result() == "original"
+
+    def test_get_all(self):
+        """Get all registered metrics."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def metric_a():
+            pass
+
+        @registry.register
+        def metric_b():
+            pass
+
+        names = {m.name for m in registry.get_all()}
+        assert names == {"metric_a", "metric_b"}
+
+    def test_get_providers(self):
+        """Get only provider metrics (collect=False)."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def provider():
+            pass
+
+        @registry.register(collect=True)
+        def collector():
+            pass
+
+        providers = registry.get_providers()
+        assert len(providers) == 1
+        assert providers[0].name == "provider"
+
+    def test_get_collectors(self):
+        """Get only collector metrics (collect=True)."""
+        registry = MetricsRegistry()
+
+        @registry.register
+        def provider():
+            pass
+
+        @registry.register(collect=True)
+        def collector():
+            pass
+
+        collectors = registry.get_collectors()
+        assert len(collectors) == 1
+        assert collectors[0].name == "collector"
+
+    def test_register_overwrites_same_name(self):
+        """Registering with the same name overwrites the previous entry."""
+        registry = MetricsRegistry()
+
+        @registry.register(name="metric")
+        def first():
+            pass
+
+        @registry.register(name="metric")
+        def second():
+            pass
+
+        assert len(registry.get_all()) == 1
+        assert registry.get_all()[0].func is second
+
+
+class TestIncludeRegistry:
+    """Tests for MetricsRegistry.include_registry method."""
+
+    def test_include_empty_registry(self):
+        """Include an empty registry does nothing."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @main.register
+        def metric_a():
+            pass
+
+        main.include_registry(other)
+        assert len(main.get_all()) == 1
+
+    def test_include_registry_adds_metrics(self):
+        """Include registry adds all metrics from the other registry."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @main.register
+        def metric_a():
+            pass
+
+        @other.register
+        def metric_b():
+            pass
+
+        @other.register
+        def metric_c():
+            pass
+
+        main.include_registry(other)
+        names = {m.name for m in main.get_all()}
+        assert names == {"metric_a", "metric_b", "metric_c"}
+
+    def test_include_registry_preserves_collect_flag(self):
+        """Include registry preserves the collect flag."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @other.register(collect=True)
+        def collector():
+            pass
+
+        main.include_registry(other)
+        assert main.get_all()[0].collect is True
+
+    def test_include_registry_raises_on_duplicate(self):
+        """Include registry raises ValueError on duplicate metric names."""
+        main = MetricsRegistry()
+        other = MetricsRegistry()
+
+        @main.register(name="metric")
+        def metric_main():
+            pass
+
+        @other.register(name="metric")
+        def metric_other():
+            pass
+
+        with pytest.raises(ValueError, match="already exists"):
+            main.include_registry(other)
+
+    def test_include_multiple_registries(self):
+        """Include multiple registries sequentially."""
+        main = MetricsRegistry()
+        sub1 = MetricsRegistry()
+        sub2 = MetricsRegistry()
+
+        @main.register
+        def base():
+            pass
+
+        @sub1.register
+        def sub1_metric():
+            pass
+
+        @sub2.register
+        def sub2_metric():
+            pass
+
+        main.include_registry(sub1)
+        main.include_registry(sub2)
+
+        names = {m.name for m in main.get_all()}
+        assert names == {"base", "sub1_metric", "sub2_metric"}
+
+
+class TestInitMetrics:
+    """Tests for init_metrics function."""
+
+    def test_returns_app(self):
+        """Returns the FastAPI app."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        result = init_metrics(app, registry)
+        assert result is app
+
+    def test_metrics_endpoint_responds(self):
+        """The /metrics endpoint returns 200."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert response.status_code == 200
+
+    def test_metrics_endpoint_content_type(self):
+        """The /metrics endpoint returns prometheus content type."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert "text/plain" in response.headers["content-type"]
+
+    def test_custom_path(self):
+        """Custom path is used for the metrics endpoint."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry, path="/custom-metrics")
+
+        client = TestClient(app)
+        assert client.get("/custom-metrics").status_code == 200
+        assert client.get("/metrics").status_code == 404
+
+    def test_providers_called_at_init(self):
+        """Provider functions are called once at init time."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = MagicMock()
+
+        @registry.register
+        def my_provider():
+            mock()
+
+        init_metrics(app, registry)
+
+        mock.assert_called_once()
+
+    def test_collectors_called_on_scrape(self):
+        """Collector functions are called on each scrape."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = MagicMock()
+
+        @registry.register(collect=True)
+        def my_collector():
+            mock()
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        client.get("/metrics")
+        client.get("/metrics")
+
+        assert mock.call_count == 2
+
+    def test_collectors_not_called_at_init(self):
+        """Collector functions are not called at init time."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = MagicMock()
+
+        @registry.register(collect=True)
+        def my_collector():
+            mock()
+
+        init_metrics(app, registry)
+
+        mock.assert_not_called()
+
+    def test_async_collectors_called_on_scrape(self):
+        """Async collector functions are awaited on each scrape."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        mock = AsyncMock()
+
+        @registry.register(collect=True)
+        async def my_async_collector():
+            await mock()
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        client.get("/metrics")
+        client.get("/metrics")
+
+        assert mock.call_count == 2
+
+    def test_mixed_sync_and_async_collectors(self):
+        """Both sync and async collectors are called on scrape."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        sync_mock = MagicMock()
+        async_mock = AsyncMock()
+
+        @registry.register(collect=True)
+        def sync_collector():
+            sync_mock()
+
+        @registry.register(collect=True)
+        async def async_collector():
+            await async_mock()
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        client.get("/metrics")
+
+        sync_mock.assert_called_once()
+        async_mock.assert_called_once()
+
+    def test_registered_metrics_appear_in_output(self):
+        """Metrics created by providers appear in /metrics output."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+
+        @registry.register
+        def my_gauge():
+            g = Gauge("test_gauge_value", "A test gauge")
+            g.set(42)
+            return g
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert b"test_gauge_value" in response.content
+        assert b"42.0" in response.content
+
+    def test_endpoint_not_in_openapi_schema(self):
+        """The /metrics endpoint is not included in the OpenAPI schema."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        init_metrics(app, registry)
+
+        schema = app.openapi()
+        assert "/metrics" not in schema.get("paths", {})
+
+
+class TestMultiProcessMode:
+    """Tests for multi-process Prometheus mode."""
+
+    def test_multiprocess_with_env_var(self):
+        """Multi-process mode works when PROMETHEUS_MULTIPROC_DIR is set."""
+        with tempfile.TemporaryDirectory() as tmpdir:
+            os.environ["PROMETHEUS_MULTIPROC_DIR"] = tmpdir
+            try:
+                # Use a separate registry to avoid conflicts with default
+                prom_registry = CollectorRegistry()
+                app = FastAPI()
+                registry = MetricsRegistry()
+
+                @registry.register
+                def mp_counter():
+                    return Counter(
+                        "mp_test_counter",
+                        "A multiprocess counter",
+                        registry=prom_registry,
+                    )
+
+                init_metrics(app, registry)
+
+                client = TestClient(app)
+                response = client.get("/metrics")
+
+                assert response.status_code == 200
+            finally:
+                del os.environ["PROMETHEUS_MULTIPROC_DIR"]
+
+    def test_single_process_without_env_var(self):
+        """Single-process mode when PROMETHEUS_MULTIPROC_DIR is not set."""
+        os.environ.pop("PROMETHEUS_MULTIPROC_DIR", None)
+
+        app = FastAPI()
+        registry = MetricsRegistry()
+
+        @registry.register
+        def sp_gauge():
+            g = Gauge("sp_test_gauge", "A single-process gauge")
+            g.set(99)
+            return g
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert response.status_code == 200
+        assert b"sp_test_gauge" in response.content
+
+
+class TestMetricsIntegration:
+    """Integration tests for the metrics module."""
+
+    def test_full_workflow(self):
+        """Full workflow: registry, providers, collectors, endpoint."""
+        app = FastAPI()
+        registry = MetricsRegistry()
+        call_count = {"value": 0}
+
+        @registry.register
+        def request_counter():
+            return Counter(
+                "integration_requests_total",
+                "Total requests",
+                ["method"],
+            )
+
+        @registry.register(collect=True)
+        def collect_uptime():
+            call_count["value"] += 1
+
+        init_metrics(app, registry)
+
+        client = TestClient(app)
+
+        response = client.get("/metrics")
+        assert response.status_code == 200
+        assert b"integration_requests_total" in response.content
+        assert call_count["value"] == 1
+
+        response = client.get("/metrics")
+        assert call_count["value"] == 2
+
+    def test_multiple_registries_merged(self):
+        """Multiple registries can be merged and used together."""
+        app = FastAPI()
+        main = MetricsRegistry()
+        sub = MetricsRegistry()
+
+        @main.register
+        def main_gauge():
+            g = Gauge("main_gauge_val", "Main gauge")
+            g.set(1)
+            return g
+
+        @sub.register
+        def sub_gauge():
+            g = Gauge("sub_gauge_val", "Sub gauge")
+            g.set(2)
+            return g
+
+        main.include_registry(sub)
+        init_metrics(app, main)
+
+        client = TestClient(app)
+        response = client.get("/metrics")
+
+        assert b"main_gauge_val" in response.content
+        assert b"sub_gauge_val" in response.content

uv.lock

@@ -226,7 +226,7 @@ wheels = [
 
 [[package]]
 name = "fastapi"
-version = "0.128.8"
+version = "0.129.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "annotated-doc" },
@@ -235,36 +235,56 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "typing-inspection" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/01/72/0df5c58c954742f31a7054e2dd1143bae0b408b7f36b59b85f928f9b456c/fastapi-0.128.8.tar.gz", hash = "sha256:3171f9f328c4a218f0a8d2ba8310ac3a55d1ee12c28c949650288aee25966007", size = 375523, upload-time = "2026-02-11T15:19:36.69Z" }
+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" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/9f/37/37b07e276f8923c69a5df266bfcb5bac4ba8b55dfe4a126720f8c48681d1/fastapi-0.128.8-py3-none-any.whl", hash = "sha256:5618f492d0fe973a778f8fec97723f598aa9deee495040a8d51aaf3cf123ecf1", size = 103630, upload-time = "2026-02-11T15:19:35.209Z" },
+    { 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" },
 ]
 
 [[package]]
 name = "fastapi-toolsets"
-version = "0.9.0"
+version = "0.10.0"
 source = { editable = "." }
 dependencies = [
     { name = "asyncpg" },
     { name = "fastapi" },
-    { name = "httpx" },
     { name = "pydantic" },
     { name = "sqlalchemy", extra = ["asyncio"] },
-    { name = "typer" },
 ]
 
 [package.optional-dependencies]
+all = [
+    { name = "httpx" },
+    { name = "prometheus-client" },
+    { name = "pytest" },
+    { name = "pytest-xdist" },
+    { name = "typer" },
+]
+cli = [
+    { name = "typer" },
+]
 dev = [
     { name = "coverage" },
+    { name = "httpx" },
+    { name = "prometheus-client" },
     { name = "pytest" },
     { name = "pytest-anyio" },
     { name = "pytest-cov" },
     { name = "pytest-xdist" },
     { name = "ruff" },
     { name = "ty" },
+    { name = "typer" },
+]
+metrics = [
+    { name = "prometheus-client" },
+]
+pytest = [
+    { name = "httpx" },
+    { name = "pytest" },
+    { name = "pytest-xdist" },
 ]
 test = [
     { name = "coverage" },
+    { name = "httpx" },
     { name = "pytest" },
     { name = "pytest-anyio" },
     { name = "pytest-cov" },
@@ -276,19 +296,22 @@ requires-dist = [
     { name = "asyncpg", specifier = ">=0.29.0" },
     { name = "coverage", marker = "extra == 'test'", specifier = ">=7.0.0" },
     { name = "fastapi", specifier = ">=0.100.0" },
-    { name = "fastapi-toolsets", extras = ["test"], marker = "extra == 'dev'" },
-    { name = "httpx", specifier = ">=0.25.0" },
+    { name = "fastapi-toolsets", extras = ["all", "test"], marker = "extra == 'dev'" },
+    { name = "fastapi-toolsets", extras = ["cli", "metrics", "pytest"], marker = "extra == 'all'" },
+    { name = "fastapi-toolsets", extras = ["pytest"], marker = "extra == 'test'" },
+    { name = "httpx", marker = "extra == 'pytest'", specifier = ">=0.25.0" },
+    { name = "prometheus-client", marker = "extra == 'metrics'", specifier = ">=0.20.0" },
     { name = "pydantic", specifier = ">=2.0" },
-    { name = "pytest", marker = "extra == 'test'", specifier = ">=8.0.0" },
+    { name = "pytest", marker = "extra == 'pytest'", specifier = ">=8.0.0" },
     { name = "pytest-anyio", marker = "extra == 'test'", specifier = ">=0.0.0" },
     { name = "pytest-cov", marker = "extra == 'test'", specifier = ">=4.0.0" },
-    { name = "pytest-xdist", marker = "extra == 'test'", specifier = ">=3.0.0" },
+    { name = "pytest-xdist", marker = "extra == 'pytest'", specifier = ">=3.0.0" },
     { name = "ruff", marker = "extra == 'dev'", specifier = ">=0.1.0" },
     { name = "sqlalchemy", extras = ["asyncio"], specifier = ">=2.0" },
     { name = "ty", marker = "extra == 'dev'", specifier = ">=0.0.1a0" },
-    { name = "typer", specifier = ">=0.9.0" },
+    { name = "typer", marker = "extra == 'cli'", specifier = ">=0.9.0" },
 ]
-provides-extras = ["test", "dev"]
+provides-extras = ["cli", "metrics", "pytest", "all", "test", "dev"]
 
 [[package]]
 name = "greenlet"
@@ -436,6 +459,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
 ]
 
+[[package]]
+name = "prometheus-client"
+version = "0.24.1"
+source = { registry = "https://pypi.org/simple" }
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