def save(self, doc):
        if doc.id:
            return self.update(doc)
        else:
            return self.insert(doc)
def detail_export(self, request, pk=None):
        serializer = ConditionExportSerializer(self.get_object())
        xml = ConditionRenderer().render([serializer.data])
        return XMLResponse(xml, name=self.get_object().key)