访问路由的django权限类不可调用

我正在尝试将权限更改为特定的路由。我想打开一些路由,我想验证用户的其他路由。我的代码如下:

from rest_framework.decorators import api_view, permission_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.viewsets import GenericViewSet

class UserViewSet(GenericViewSet):
      queryset = User.objects.all()
      serializer_class = UserSerializer
      permission_classes = [IsAuthenticated]
      renderer_classes = [JSONRenderer]


    @action(url_path="an/api/path", detail=False, methods=["post"], renderer_classes=[JSONRenderer])
    @api_view(['GET'])
    @permission_classes((IsAuthenticated, ))
    def get_stuff(self, request):
        #Will get stuff

但我一直有个错误:

 File "/code/api/views/UserViewSet.py", line 16, in <module>
api_1     |     class UserViewSet(GenericViewSet):
api_1     |   File "/code/api/views/UserViewSet.py", line 33, in UserViewSet
api_1     |     @permission_classes((IsAuthenticated, ))
api_1     | TypeError: 'list' object is not callable

在我的settings.py中,我有:

REST_FRAMEWORK = {
    "DEFAULT_PERMISSION_CLASSES": [
        "rest_framework.permissions.IsAuthenticated",
    ],
    "DEFAULT_AUTHENTICATION_CLASSES": [
        "rest_framework_jwt.authentication.JSONWebTokenAuthentication",
        "rest_framework.authentication.SessionAuthentication",
        "rest_framework.authentication.BasicAuthentication",
    ],
    "DEFAULT_RENDERER_CLASSES": (
        "rest_framework.renderers.JSONRenderer",
    )

你知道为什么它总是抛出list“object is not callable function”吗?