Merge pull request #1217 from benpbenp/master

Fix object creation with reverse M2M when related_name unspecified

rest_framework/serializers.py

@@ -878,7 +878,7 @@ class ModelSerializer(Serializer):
 
         # Reverse m2m relations
         for (obj, model) in meta.get_all_related_m2m_objects_with_model():
-            field_name = obj.field.related_query_name()
+            field_name = obj.get_accessor_name()
             if field_name in attrs:
                 m2m_data[field_name] = attrs.pop(field_name)