class name added to unkown field error (#9019)

Author: aminiun

rest_framework/serializers.py

@@ -1372,8 +1372,8 @@ def build_unknown_field(self, field_name, model_class):
         Raise an error on any unknown fields.
         """
         raise ImproperlyConfigured(
-            'Field name `%s` is not valid for model `%s`.' %
-            (field_name, model_class.__name__)
+            'Field name `%s` is not valid for model `%s` in `%s.%s`.' %
+            (field_name, model_class.__name__, self.__class__.__module__, self.__class__.__name__)
         )
 
     def include_extra_kwargs(self, kwargs, extra_kwargs):

tests/test_model_serializer.py

@@ -315,7 +315,8 @@ class Meta:
                 model = RegularFieldsModel
                 fields = ('auto_field', 'invalid')
 
-        expected = 'Field name `invalid` is not valid for model `RegularFieldsModel`.'
+        expected = 'Field name `invalid` is not valid for model `RegularFieldsModel` ' \
+                   'in `tests.test_model_serializer.TestSerializer`.'
         with self.assertRaisesMessage(ImproperlyConfigured, expected):
             TestSerializer().fields