gistfile1.py

class ResourceObjectRelatedField(serializers.RelatedField):

    def to_internal_value(self, data):
        return super(ResourceObjectRelatedField, self).to_internal_value(data)

    def to_representation(self, value):
        if isinstance(value, Organization):
            serializer = OrganizationSerializer(value)
        else:
            raise Exception('Unexpected related object')

        return serializer.data