Ticket #6127: admin-ordering.patch

django/db/models/query.py

@@ -546 +546 @@
                 if "." in col_name:
                     table_prefix, col_name = col_name.split('.', 1)
                     table_prefix = qn(table_prefix) + '.'
+                   if col_name.startswith('-'):
+                       col_name = col_name[1:]
+                       order = "DESC"
                 else:
                     # Use the database table as a column prefix if it wasn't given,
                     # and if the requested column isn't a custom SELECT.