def METHOD_NAME(self, subject_id, entity_id, ava):
    """ """
    item = self._cache.find_one({"subject_id": subject_id, "entity_id": entity_id})
    info = item["info"]
    info["ava"].METHOD_NAME(ava)
    self._cache.METHOD_NAME({"subject_id": subject_id, "entity_id": entity_id}, {"$set": {"info": info}})