Fixed #22720 -- Migrations attempt to create _order twice.

django · May 28, 2014 · 6cfa2fa · 6cfa2fa
1 parent 7e3cf3c
commit 6cfa2fa
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/django/db/models/options.py b/django/db/models/options.py
@@ -167,7 +167,8 @@ def _prepare(self, model):
         if self.order_with_respect_to:
             self.order_with_respect_to = self.get_field(self.order_with_respect_to)
             self.ordering = ('_order',)
-            model.add_to_class('_order', OrderWrt())
+            if not any(isinstance(field, OrderWrt) for field in model._meta.local_fields):
+                model.add_to_class('_order', OrderWrt())
         else:
             self.order_with_respect_to = None