history_mixin.py 文件源码

def version_at_time_q(cls, base_id, timestamp, db=None):
        db = db or cls.default_db
        # Version that can be used without first
        # return db.query(cls).distinct(cls.base_id).filter(
        #     cls.base_id == self.base_id,
        #     (cls.tombstone_date == None) || (cls.tombstone_date > timestamp)
        #     ).order_by(cls.base_id, nullslast(asc(cls.tombstone_date)))
        return db.query(cls).filter(
            cls.base_id == base_id,
            (cls.tombstone_date == None) | (cls.tombstone_date > timestamp)
        ).order_by(nullslast(asc(cls.tombstone_date)))