ó TR¹Nc@s3dZddlmZdejfd„ƒYZdS(sž Field-like classes that aren't really fields. It's easier to use objects that have the same attributes as fields sometimes (avoids a lot of special casing). iÿÿÿÿ(tfieldstOrderWrtcBseZdZd„ZRS(sn A proxy for the _order database field that is used when Meta.order_with_respect_to is specified. cOs1d|ds