api.py 文件源码

def resource_get_by_id(
        context, resources, resource_id, session=None, for_update=False
        ):
    """Get resource for the unique resource id."""
    model = _get_resource_model(resources)

    query = model_query(context, model, project_only=True, session=session)

    if resources in ("hosts", "network-devices"):
        query = query.filter_by(type=resources.replace("-", "_"))

    query = query.filter_by(id=resource_id)

    if for_update:
        query = query.with_for_update()

    try:
        resource = query.one()
    except sa_exc.NoResultFound:
        raise exceptions.NotFound()
    else:
        return resource