Returns a Queryset of all model instances that can be edited by the 
        admin site. This is used by changelist_view.

def queryset(self, request):
        """Returns a Queryset of all model instances that can be edited by the 
        admin site. This is used by changelist_view."""
        query_set = self.model._default_manager.all_with_deleted()
        ordering = self.ordering or ()
        if ordering:
            query_set = query_set.order_by(*ordering)
        return query_set