schema.py 文件源码

def unwrap_item(self, item):
        """
        If the schema has an existing instance the id field must be set.
        :raises ValidationError: id field isn't present when required.
        """
        id_in_item = 'id' in item
        if self.load_existing and not id_in_item:
            # Updating Resources must include type and id keys
            # http://jsonapi.org/format/1.1/#crud-updating
            raise ma.ValidationError([{'detail': '`data` object must include `id` key.',
                                       'source': {'pointer': '/data'}}])

        if not self.load_existing and id_in_item:
            # Don't support client side identifier generation at this time.
            raise ForbiddenIdError()

        return super().unwrap_item(item)