api.py 文件源码

def _device_labels_delete(context, device_type, device_id, labels):
    """Delete labels from the device labels list if it matches
    the given label in the query, otherwise do nothing."""
    session = get_session()
    with session.begin():
        devices = with_polymorphic(models.Device, '*')
        query = model_query(context, devices, session=session,
                            project_only=True)
        query = query.filter_by(type=device_type)
        query = query.filter_by(id=device_id)
        try:
            device = query.one()
        except sa_exc.NoResultFound:
            raise exceptions.NotFound()

        for label in labels["labels"]:
            device.labels.discard(label)
        device.save(session)
        return device