added coverage test

Author: CosmoV

fastapi_jsonapi/querystring.py

@@ -212,8 +212,6 @@ def pagination(self) -> PaginationQueryStringManager:
 
         return pagination
 
-    # TODO: finally use this! upgrade Sqlachemy Data Layer
-    #  and add to all views (get list/detail, create, patch)
     @property
     def fields(self) -> Dict[str, List[str]]:
         """
@@ -238,8 +236,7 @@ def fields(self) -> Dict[str, List[str]]:
                 msg = f"Application has no resource with type {resource_type!r}"
                 raise InvalidType(msg)
 
-            schema: Type[BaseModel] = RoutersJSONAPI.all_jsonapi_routers[resource_type]._schema
-            self._get_schema(resource_type)
+            schema: Type[BaseModel] = self._get_schema(resource_type)
 
             for field_name in field_names:
                 if field_name == "":
@@ -255,8 +252,7 @@ def fields(self) -> Dict[str, List[str]]:
         return {resource_type: set(field_names) for resource_type, field_names in fields.items()}
 
     def _get_schema(self, resource_type: str) -> Type[BaseModel]:
-        target_router = RoutersJSONAPI.all_jsonapi_routers[resource_type]
-        return target_router.detail_response_schema
+        return RoutersJSONAPI.all_jsonapi_routers[resource_type]._schema
 
     def get_sorts(self, schema: Type["TypeSchema"]) -> List[Dict[str, str]]:
         """

tests/test_api/test_api_sqla_with_includes.py

@@ -318,6 +318,32 @@ async def test_select_custom_fields_with_includes(
             ),
         }
 
+    async def test_select_custom_fields_for_includes_without_requesting_includes(
+        self,
+        app: FastAPI,
+        client: AsyncClient,
+        user_1: User,
+    ):
+        url = app.url_path_for("get_user_list")
+
+        params = QueryParams([("fields[post]", "title")])
+        response = await client.get(url, params=str(params))
+
+        assert response.status_code == status.HTTP_200_OK, response.text
+        response_data = response.json()
+
+        assert response_data == {
+            "data": [
+                {
+                    "attributes": UserAttributesBaseSchema.from_orm(user_1),
+                    "id": str(user_1.id),
+                    "type": "user",
+                },
+            ],
+            "jsonapi": {"version": "1.0"},
+            "meta": {"count": 1, "totalPages": 1},
+        }
+
 
 class TestCreatePostAndComments:
     async def test_get_posts_with_users(