"""This is only there for backward compatible jinja2 templates."""
        if self.default_view is None:
            return conf.get("webserver", "dag_default_view").lower()
        else:
            return self.default_view
    @staticmethod
    @provide_session
    def deactivate_unknown_dags(active_dag_ids, session=NEW_SESSION):
        """
        Given a list of known DAGs, deactivate any other DAGs that are
        marked as active in the ORM.
        :param active_dag_ids: list of DAG IDs that are active
        :return: None
        """
        if len(active_dag_ids) == 0:
            return
        for dag in session.query(DagModel).filter(~DagModel.dag_id.in_(active_dag_ids)).all():
            dag.is_active = False
            session.merge(dag)
        session.commit()
    @staticmethod
    @provide_session
    def deactivate_stale_dags(expiration_date, session=NEW_SESSION):