Fixed #7813 -- Allow pickling of Query classes that use select_related().

Based on a patch from Justin Bronn.

The test in this patch most likely breaks on Oracle. That's another issue.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8053 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/sql/query.py

@@ -106,6 +106,8 @@ class Query(object):
         Pickling support.
         """
         obj_dict = self.__dict__.copy()
+        obj_dict['related_select_fields'] = []
+        obj_dict['related_select_cols'] = []
         del obj_dict['connection']
         return obj_dict