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Я пытаюсь настроить разрешения для моего API модели пользователя. Моя цель — позволить любому создавать, перечислять и получать пользователей, но только позволить пользователю частично обновлять себя. Однако, когда я пытаюсь вызвать свой API, я получаю:

 TypeError: 'tuple' object is not callable
 

views.py

 class UserViewSet(viewsets.ViewSet):

    def get_permissions(self):
       if self.action == 'partial_update':
           self.permission_classes = (IsAuthenticated, IsUpdateUser,) #Also tried with [isAuthenticated, isUpdateUser], the same goes for the other if statements
       if self.action in ('list','retrieve'):
           self.permission_classes = (SAFE_METHODS,)
       if self.action == 'create':
           self.permission_classes = (AllowAny,)
       return super(self.__class__, self).get_permissions()

    def list(self, request):
        queryset = User.objects.all()
        serializer = UserSerializer(queryset, many=True)
        return Response(serializer.data)

    def retrieve(self, request, pk=None):
        queryset = User.objects.all()
        user = get_object_or_404(queryset, pk=pk)
        serializer = UserSerializer(user)
        return Response(serializer.data)

    def create(self, request, format='json'):
        serializer = UserCreateSerializer(data=request.data)
        if serializer.is_valid():
            user = serializer.save()
            if user:
                token = Token.objects.create(user=user)
                json = serializer.data
                json['token'] = token.key
                return Response(json, status=status.HTTP_201_CREATED)

        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def partial_update(self, request, *args, **kwargs):
        instance = self.queryset.get(pk=kwargs.get('pk'))
        serializer = self.UserSerializer(instance, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response(serializer.data)

 

permissions.py

 class IsUpdateUser(permissions.BasePermission):

    def has_permission(self, request, view):
        # can write custom code
        print (view.kwargs)
        try:
            user = User.objects.get(
                pk=view.kwargs['pk'])
        except:
            return False

        if request.user == user:
            return True

        return False
 

Полный журнал для попытки получить пользователя с pk = 1

 Internal Server Error: /users/get-user/1/
Traceback (most recent call last):
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesdjangocorehandlersexception.py", line 34, in inner
    response = get_response(request)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesdjangocorehandlersbase.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesdjangocorehandlersbase.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesdjangoviewsdecoratorscsrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviewsets.py", line 116, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 495, in dispatch
    response = self.handle_exception(exc)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 455, in handle_exception
    self.raise_uncaught_exception(exc)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 483, in dispatch
    self.initial(request, *args, **kwargs)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 401, in initial
    self.check_permissions(request)
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 333, in check_permissions
    for permission in self.get_permissions():
  File "C:UsersmaxsoDesktopkandzigmabackenduserviews.py", line 38, in get_permissions
    return super(self.__class__, self).get_permissions()
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 280, in get_permissions
    return [permission() for permission in self.permission_classes]
  File "C:UsersmaxsoEnvszigma_envlibsite-packagesrest_frameworkviews.py", line 280, in <listcomp>
    return [permission() for permission in self.permission_classes]
TypeError: 'tuple' object is not callable
[18/Apr/2019 13:33:45] "GET /users/get-user/1/ HTTP/1.1" 500 18019