fix: skip redundant refresh/reload round trips in create() and update()

tests/conftest.py

@@ -476,3 +476,26 @@ async def db_session(engine):
         # Drop tables after test
         async with engine.begin() as conn:
             await conn.run_sync(Base.metadata.drop_all)
+
+
+@pytest.fixture(scope="function")
+async def db_session_expire_on_commit(engine):
+    """Session with expire_on_commit=True (the SQLAlchemy default).
+
+    Attributes read off an instance after commit are expired and trigger an
+    implicit (sync) refresh under this setting — which fails under asyncio
+    with MissingGreenlet. The other ``db_session`` fixture uses
+    ``expire_on_commit=False`` and would not catch that class of bug.
+    """
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    session_factory = async_sessionmaker(engine, expire_on_commit=True)
+    session = session_factory()
+
+    try:
+        yield session
+    finally:
+        await session.close()
+        async with engine.begin() as conn:
+            await conn.run_sync(Base.metadata.drop_all)

tests/test_crud.py

@@ -417,6 +417,55 @@ class TestDefaultLoadOptionsIntegration:
         assert updated.role is not None
         assert updated.role.name == "admin"
 
+    @pytest.mark.anyio
+    async def test_default_load_options_applied_to_create_expire_on_commit(
+        self, db_session_expire_on_commit: AsyncSession
+    ):
+        """create()'s reload uses captured PK values, not an expired instance attribute.
+
+        Regression test for MissingGreenlet: reading a PK off `db_model` after
+        commit under expire_on_commit=True (the SQLAlchemy default) would
+        trigger an implicit sync refresh, which fails under asyncio.
+        """
+        UserWithDefaultLoad = CrudFactory(
+            User, default_load_options=[selectinload(User.role)]
+        )
+        role = await RoleCrud.create(
+            db_session_expire_on_commit, RoleCreate(name="admin")
+        )
+        user = await UserWithDefaultLoad.create(
+            db_session_expire_on_commit,
+            UserCreate(username="alice", email="alice@test.com", role_id=role.id),
+        )
+        assert user.role is not None
+        assert user.role.name == "admin"
+
+    @pytest.mark.anyio
+    async def test_default_load_options_applied_to_update_expire_on_commit(
+        self, db_session_expire_on_commit: AsyncSession
+    ):
+        """update()'s reload uses captured PK values, not an expired instance attribute.
+
+        Regression test for MissingGreenlet under expire_on_commit=True.
+        """
+        UserWithDefaultLoad = CrudFactory(
+            User, default_load_options=[selectinload(User.role)]
+        )
+        role = await RoleCrud.create(
+            db_session_expire_on_commit, RoleCreate(name="admin")
+        )
+        user = await UserCrud.create(
+            db_session_expire_on_commit,
+            UserCreate(username="alice", email="alice@test.com"),
+        )
+        updated = await UserWithDefaultLoad.update(
+            db_session_expire_on_commit,
+            UserUpdate(role_id=role.id),
+            filters=[User.id == user.id],
+        )
+        assert updated.role is not None
+        assert updated.role.name == "admin"
+
     @pytest.mark.anyio
     async def test_load_options_overrides_default_load_options(
         self, db_session: AsyncSession