def METHOD_NAME(self, request, selection, asset_key):
    # assumes user is allowed to see this note
    bundle = self.build_bundle(obj=selection, request=request)
    dehydrated = self.full_dehydrate(bundle)
    bundle.data['asset_key'] = '%s_%s' % (asset_key,
                                          bundle.data['asset_id'])
    return self._meta.serializer.to_simple(dehydrated, None)