Now works with nested relationship prefetching.
Now works with nested relationship prefetching.

The validation here is awkward (following the relationships through
the model fields), I couldn't find a better way to ensure the
included args exist for a django prefetch rather than erroring out.

Instawork/django-rest-framework-json-api,abdulhaq-e/django-rest-framework-json-api,django-json-api/django-rest-framework-json-api,leo-naeka/django-rest-framework-json-api,django-json-api/django-rest-framework-json-api,django-json-api/rest_framework_ember