Ticket #3849: onetoonefield-edit_inline.patch

django/db/models/manipulators.py

@@ -162 +162 @@
                     # old to the new, to see which fields have changed.
                     old_rel_obj = None
                     if self.change:
-                        if rel_new_data[related.opts.pk.name][0]:
+                        from django.db.models.fields.related import OneToOneField
+                        if isinstance(related.opts.pk,OneToOneField):
+                            old_rel_obj = getattr(self.original_object, related.get_accessor_name())
+                        elif rel_new_data[related.opts.pk.name][0]:
                             try:
                                 old_rel_obj = getattr(self.original_object, related.get_accessor_name()).get(**{'%s__exact' % related.opts.pk.name: rel_new_data[related.opts.pk.attname][0]})
                             except ObjectDoesNotExist: