Ticket #15962: 15962.diff

django/db/models/fields/related.py

@@ -217 +217 @@
         # related object in a table-spanning query. It uses the lower-cased
         # object_name by default, but this can be overridden with the
         # "related_name" option.
-        return self.rel.related_name or self.opts.object_name.lower()
+        return self.rel.related_name or (self.opts.object_name.lower() + '_set')
 
 class SingleRelatedObjectDescriptor(object):
     # This class provides the functionality that makes the related-object