Tweak utils and tests

fastapi/dependencies/utils.py

@@ -709,13 +709,12 @@ def _validate_value_with_model_field(
     if value is None:
         if field.required:
             if PYDANTIC_V2:
-                return None, [
-                    get_missing_field_error(
-                        loc, field.include_error_input, field.include_error_url
-                    )
-                ]
+                error = get_missing_field_error(
+                    loc, field.include_error_input, field.include_error_url
+                )
             else:
-                return None, [get_missing_field_error(loc=loc)]
+                error = get_missing_field_error(loc)
+            return None, [error]
         else:
             return deepcopy(field.default), []
     v_, errors_ = field.validate(value, values, loc=loc)
@@ -931,13 +930,12 @@ async def request_body_to_args(
             # If the received body is a list, not a dict
             except AttributeError:
                 if PYDANTIC_V2:
-                    errors.append(
-                        get_missing_field_error(
-                            loc, field.include_error_input, field.include_error_url
-                        )
+                    error = get_missing_field_error(
+                        loc, field.include_error_input, field.include_error_url
                     )
                 else:
-                    errors.append(get_missing_field_error(loc))
+                    error = get_missing_field_error(loc)
+                errors.append(error)
                 continue
         v_, errors_ = _validate_value_with_model_field(
             field=field, value=value, values=values, loc=loc

fastapi/utils.py

@@ -80,10 +80,7 @@ def create_model_field(
         )
     else:
         field_info = field_info or FieldInfo()
-    kwargs = {
-        "name": name,
-        "field_info": field_info,
-    }
+    kwargs = {"name": name, "field_info": field_info}
     if PYDANTIC_V2:
         kwargs.update(
             {

tests/test_validation_error_fields.py

@@ -23,17 +23,19 @@ def test_input_and_url_fields(include_error_input, include_error_url):
     def path2(query_param: int):
         return query_param
 
-    router = APIRouter()
+    router = APIRouter(
+        include_error_input=include_error_input, include_error_url=include_error_url
+    )
 
-    @app.get("/path3/{path_param}")
+    @router.get("/path3/{path_param}")
     def path3(path_param: int):
         return {"path_param": path_param}
 
-    @app.get("/path4/")
+    @router.get("/path4/")
     def path4(query_param: int):
         return query_param
 
-    app.include_router(router, prefix="/prefix")
+    app.include_router(router)
     client = TestClient(app)
 
     with client: