@classmethod
def update(cls, ob, plus_ob):
    """
        Update single object
        :param ob: Object or list of objects containing `objectId` attribute
        :param plus_ob: -d json.dumps(plus_ob)
                        -d '{"score":73453}'                         -d '{"opponents":{"__op":"Delete"}}'                         -d '{"score":{"__op":"Increment","amount":1}}'                         -d '{"skills":{"__op":"AddUnique/ Add/ Remove","objects":["flying","kungfu"]}}'                         -d '{"opponents":{
                                "__op":"AddRelation/ RemoveRelation",
                                "objects":[{"__type":"Pointer","className":"Player","objectId":"51b0f0e851c16221"}]}
                            }'         :return: {"updatedAt":"...","objectId":"..."}
        """
    return cls._update_avos(cls.__name__, ob, plus_ob)
