Fixed #10163: add an artificial ordering to querysets used by formsets, thus ensuring that POSTed data "lines up" correctly every time. Thanks to Karen Tracey for pointing in the right direction here.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10625 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/models.py

@@ -406,6 +406,13 @@ class BaseModelFormSet(BaseFormSet):
                 qs = self.queryset
             else:
                 qs = self.model._default_manager.get_query_set()
+
+            # If the queryset isn't already ordered we need to add an
+            # artificial ordering here to make sure that all formsets
+            # constructed from this queryset have the same form order.
+            if not qs.ordered:
+                qs = qs.order_by(self.model._meta.pk.name)
+
             if self.max_num > 0:
                 self._queryset = qs[:self.max_num]
             else: