fields.py 文件源码

def get_path_info(self):
        opts = self.remote_field.model._meta
        object_id_field = opts.get_field(self.object_id_field_name)
        if object_id_field.model != opts.model:
            return self._get_path_info_with_parent()
        else:
            target = opts.pk
            return [PathInfo(self.model._meta, opts, (target,), self.remote_field, True, False)]