RestPack/restpack_serializer — pull request #110 by parrish (2014-12-05 18:11:56+00:00)
Title: Don't attempt to side load a null record in a belongs_to association

I'm not sure if this behavior was intentional, but I came across what is probably a bug.

In terms of the models in the specs: given a Song without an album, side-loading the Album attempts to find a record with a nil id.