utils.py 文件源码

def get_or_create(session, model, defaults=None, **kwargs):
    """
    :param Session session:
    :param model:
    :param defaults:
    :param kwargs:
    :return:
    """
    instance = session.query(model).filter_by(**kwargs).first()
    if instance:
        return instance, False
    else:
        params = dict((k, v) for k, v in kwargs.items() if not isinstance(v, ClauseElement))
        params.update(defaults or {})
        instance = model(**params)
        session.add(instance)
        return instance, True