Use the same ordering as TreeManager

def get_queryset(self):  # DROP_WITH_DJANGO15
        """Use the same ordering as TreeManager"""

        args = (self.model._mptt_meta.tree_id_attr,
                self.model._mptt_meta.left_attr)
        method = 'get_query_set' if django.VERSION < (1, 6) else 'get_queryset'
        return getattr(super(SectionManager, self), method)().order_by(*args)