json - django-piston: how to get values of a many to many field? -

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I have several models with a model I want to get all the information on a specific record (information related to other models Including) return by JSON.

How to get the Django-Piston to display those values? I would only be happy with the primary key or can you recommend another option?

I may be wrong, but it should do this: 

  Category PersonHandler: Model = Person Area = ('id', ('friend', ('id', 'name')), 'name') def (self, requested): Return Person.objects.filter (...)

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