code: def get(self, *args, **kwargs):
          
          return self.model._default_manager.get(*args, **kwargs)
docs: Quick and dirty hack to fix change_view and delete_view; they use
          self.queryset(request).get(...) to get the object they should work
          with. Our modifications to the queryset when INCLUDE_ANCESTORS is
          enabled make get() fail often with a MultipleObjectsReturned
          exception.