fix last_update
@@ -271,7 +271,7 @@ class ChangeSet(models.Model):
@property
def last_update(self):
if self.changed_objects is None:
- return self.relevant_changed_objects().aggregate(Max('last_update'))['last_update__max']
+ return self.changed_objects_set.aggregate(Max('last_update'))['last_update__max']
return max(chain(*self.changed_objects.values()), key=attrgetter('last_update'))
