base.py 文件源码

def get_id(self, model, **conditions):
        """
        Retrieve unique ID of record in database model that satisfies conditions.

        If no unique record exists, communicate error in log file and return None.

        :param model: Marcotti-MLS data model.
        :param conditions: Dictionary of fields/values that describe a record in model.
        :return: Unique ID of database record.
        """
        record_id = None
        try:
            record_id = self.session.query(model).filter_by(**conditions).one().id
        except NoResultFound:
            logger.error("{} has no records in Marcotti database for: {}".format(model.__name__, conditions))
        except MultipleResultsFound:
            logger.error("{} has multiple records in Marcotti database for: {}".format(model.__name__, conditions))
        return record_id