Ticket #2895: main.diff

main.py

@@ -706 +706 @@
                 # For OneToOneFields, don't try to order by the related object's ordering criteria.
                 pass
             elif isinstance(f.rel, models.ManyToOneRel):
-                rel_ordering = f.rel.to._meta.ordering and f.rel.to._meta.ordering[0] or f.rel.to._meta.pk.column
+                o_field = f.rel.to._meta.ordering[0]
+                if o_field[0] == '-':
+                    o_field = o_field[1:]
+                rel_ordering = f.rel.to._meta.ordering and o_field or f.rel.to._meta.pk.column
                 lookup_order_field = '%s.%s' % (f.rel.to._meta.db_table, rel_ordering)
 
         # Set ordering.