matllubos/django-piston — pull request #5 by oskholl (2014-12-05 12:03:27+00:00)
Title: Serialization of object is flat in case of PDF and CSV converters

In PDF and CSV export, there needn't be any deep serialization of objects, each field of the serialized object must correspond to one column in the export table, not multiple columns. Therefore, __unicode__ method is called on nested objects instead of recursive serialization.