fix many_to_many lazy registration in fastapi cloned models, fixed ForeignKey not treated as subclasses of BaseModels in json schema

tests/test_more_reallife_fastapi.py

@@ -77,13 +77,15 @@ async def create_category(category: Category):
 
 
 @app.put("/items/{item_id}")
-async def get_item(item_id: int, item: Item):
+async def update_item(item_id: int, item: Item):
     item_db = await Item.objects.get(pk=item_id)
     return await item_db.update(**item.dict())
 
 
 @app.delete("/items/{item_id}")
-async def delete_item(item_id: int, item: Item):
+async def delete_item(item_id: int, item: Item = None):
+    if item:
+        return {"deleted_rows": await item.delete()}
     item_db = await Item.objects.get(pk=item_id)
     return {"deleted_rows": await item_db.delete()}
 
@@ -111,8 +113,23 @@ def test_all_endpoints():
         items = [Item(**item) for item in response.json()]
         assert items[0].name == "New name"
 
-        response = client.delete(f"/items/{item.pk}", json=item.dict())
+        response = client.delete(f"/items/{item.pk}")
         assert response.json().get("deleted_rows", "__UNDEFINED__") != "__UNDEFINED__"
         response = client.get("/items/")
         items = response.json()
         assert len(items) == 0
+
+        client.post(
+            "/items/", json={"name": "test_2", "id": 2, "category": category}
+        )
+        response = client.get("/items/")
+        items = response.json()
+        assert len(items) == 1
+
+        item = Item(**items[0])
+        response = client.delete(f"/items/{item.pk}", json=item.dict())
+        assert response.json().get("deleted_rows", "__UNDEFINED__") != "__UNDEFINED__"
+
+        response = client.get("/docs/")
+        assert response.status_code == 200
+