sqla.py 文件源码

def _json_is_known_instance(json_record, object_importer):
        if isinstance(json_record, string_types):
            identifier = json_record
            json_record = None
        elif isinstance(json_record, dict):
            identifier = json_record.get('@id', None)
        if identifier:
            if object_importer is not None:
                instance = object_importer.get_existing(identifier)
            else:
                instance = get_named_object(identifier)
            return instance