Django Decorator AttributeError：“ FileViewSet”对象没有属性“ _meta”

Question

我正在尝试应用以下装饰器：

def has_folder_access(func):
    def wrapper(request, *args, **kwargs):
        user_id = get_user_id(kwargs['context']['request'])
        folder_id = kwargs['data']['folder_id']
        user = get_user(user_id)
        if user.role == 'super_admin' and check_file_add_access(user.id, folder_id):
            return func(request, *args, **kwargs)
        else:
            return serializers.ValidationError({'type': 'error',
                                                'content': 'You do not have access to that folder.'})
    return wrapper

到序列化器类：

@has_folder_access
class FileSerializer(serializers.ModelSerializer):
...

但我不断得到：

  File "C:\Python37\lib\site-packages\rest_framework\utils\model_meta.py", line 35, in get_field_info
    opts = model._meta.concrete_model._meta
AttributeError: 'FileViewSet' object has no attribute '_meta'

任何提示/想法为什么会发生这种情况？