fields.py 文件源码

def _deserialize(self, value, attr, data):
        embedded_document_cls = self.embedded_document_cls
        if isinstance(value, embedded_document_cls):
            return value
        # Handle inheritance deserialization here using `cls` field as hint
        if embedded_document_cls.opts.offspring and isinstance(value, dict) and 'cls' in value:
            to_use_cls_name = value.pop('cls')
            if not any(o for o in embedded_document_cls.opts.offspring
                       if o.__name__ == to_use_cls_name):
                raise ValidationError(_('Unknown document `{document}`.').format(
                    document=to_use_cls_name))
            try:
                to_use_cls = embedded_document_cls.opts.instance.retrieve_embedded_document(
                    to_use_cls_name)
            except NotRegisteredDocumentError as e:
                raise ValidationError(str(e))
            return to_use_cls(**value)
        else:
            # `Nested._deserialize` calls schema.load without partial=True
            data, errors = self.schema.load(value, partial=True)
            if errors:
                raise ValidationError(errors, data=data)
            return self._deserialize_from_mongo(data)