Ticket #3906: generic.py.patch

generic.py

@@ -118 +118 @@
         return self.object_id_field_name
 
     def m2m_reverse_name(self):
-        return self.object_id_field_name
+       return self.model._meta.pk.attname
 
     def contribute_to_class(self, cls, name):
         super(GenericRelation, self).contribute_to_class(cls, name)