fix: cascade delete M2M association rows via ORM session (#121)

src/fastapi_toolsets/crud/factory.py

@@ -14,7 +14,6 @@ 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
 from sqlalchemy.dialects.postgresql import insert
 from sqlalchemy.exc import NoResultFound
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -674,8 +673,10 @@ class AsyncCrud(Generic[ModelType]):
             ``None``, or ``Response[None]`` when ``return_response=True``.
         """
         async with get_transaction(session):
-            q = sql_delete(cls.model).where(and_(*filters))
+            result = await session.execute(select(cls.model).where(and_(*filters)))
-            await session.execute(q)
+            objects = result.scalars().all()
+            for obj in objects:
+                await session.delete(obj)
         if return_response:
             return Response(data=None)
         return None

tests/test_crud.py

@@ -35,6 +35,7 @@ from .conftest import (
     RoleCursorCrud,
     RoleRead,
     RoleUpdate,
+    Tag,
     TagCreate,
     TagCrud,
     User,
@@ -480,6 +481,69 @@ class TestCrudDelete:
         assert result.data is None
         assert await RoleCrud.first(db_session, [Role.id == role.id]) is None
 
+    @pytest.mark.anyio
+    async def test_delete_m2m_cascade(self, db_session: AsyncSession):
+        """Deleting a record with M2M relationships cleans up the association table."""
+        from sqlalchemy import text
+
+        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 Delete Test",
+                author_id=user.id,
+                tag_ids=[tag1.id, tag2.id],
+            ),
+        )
+
+        await PostM2MCrud.delete(db_session, [Post.id == post.id])
+
+        # Post is gone
+        assert await PostCrud.first(db_session, [Post.id == post.id]) is None
+
+        # Association rows are gone — tags themselves must still exist
+        assert await TagCrud.first(db_session, [Tag.id == tag1.id]) is not None
+        assert await TagCrud.first(db_session, [Tag.id == tag2.id]) is not None
+
+        # No orphaned rows in post_tags
+        result = await db_session.execute(
+            text("SELECT COUNT(*) FROM post_tags WHERE post_id = :pid").bindparams(
+                pid=post.id
+            )
+        )
+        assert result.scalar() == 0
+
+    @pytest.mark.anyio
+    async def test_delete_m2m_does_not_delete_related_records(
+        self, db_session: AsyncSession
+    ):
+        """Deleting a post with M2M tags must not delete the tags themselves."""
+        user = await UserCrud.create(
+            db_session, UserCreate(username="author2", email="author2@test.com")
+        )
+        tag = await TagCrud.create(db_session, TagCreate(name="shared_tag"))
+
+        post1 = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(title="Post 1", author_id=user.id, tag_ids=[tag.id]),
+        )
+        post2 = await PostM2MCrud.create(
+            db_session,
+            PostM2MCreate(title="Post 2", author_id=user.id, tag_ids=[tag.id]),
+        )
+
+        # Delete only post1
+        await PostM2MCrud.delete(db_session, [Post.id == post1.id])
+
+        # Tag and post2 still exist
+        assert await TagCrud.first(db_session, [Tag.id == tag.id]) is not None
+        assert await PostCrud.first(db_session, [Post.id == post2.id]) is not None
+
 
 class TestCrudExists:
     """Tests for CRUD exists operations."""