some_fields.py

class MyResource(ModelResource):
    def full_dehydrate(self, bundle):
        """
        Given a bundle with an object instance, extract the information from it
        to populate the resource.
        """
        requested = bundle.request.GET.get('fields', '')
        if requested:
            requested = set(requested_fields.split(',')) | set(self.fields.keys())

        # Dehydrate each field.
        for field_name, field_object in self.fields.items():
            if requested and not field_name in requested:
                continue
            # A touch leaky but it makes URI resolution work.
            if getattr(field_object, 'dehydrated_type', None) == 'related':
                field_object.api_name = self._meta.api_name
                field_object.resource_name = self._meta.resource_name

            bundle.data[field_name] = field_object.dehydrate(bundle)

            # Check for an optional method to do further dehydration.
            method = getattr(self, "dehydrate_%s" % field_name, None)

            if method:
                bundle.data[field_name] = method(bundle)

        bundle = self.dehydrate(bundle)
        return bundle