Fixed #3741 -- Fixed serialization of GenericRelations. Thanks for the report, Alexander Solovyov.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4752 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/options.py

@@ -84,6 +84,7 @@ class Options(object):
             self.fields.insert(bisect(self.fields, field), field)
             if not self.pk and field.primary_key:
                 self.pk = field
+                field.serialize = False
 
     def __repr__(self):
         return '<Options for %s>' % self.object_name