def save(self, doc):
        if doc.id:
            return self.update(doc)
        else:
            return self.insert(doc)
def lazy_gettext(self, text: str, lang: str = None):
        if not babel_imported:
            raise RuntimeError('babel module is not imported. Check that you installed it.')
        return LazyProxy(self.gettext, text, lang, enable_cache=False)