✨ Add support for cascade delete relationships: cascade_delete, ondelete, and passive_deletes (#983)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

tests/test_field_sa_column.py

@@ -108,3 +108,14 @@ def test_sa_column_no_index() -> None:
                 index=True,
                 sa_column=Column(Integer, primary_key=True),
             )
+
+
+def test_sa_column_no_ondelete() -> None:
+    with pytest.raises(RuntimeError):
+
+        class Item(SQLModel, table=True):
+            id: Optional[int] = Field(
+                default=None,
+                sa_column=Column(Integer, primary_key=True),
+                ondelete="CASCADE",
+            )