Django rest framework permission_classes of ViewSet method

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I think there is no inbuilt solution for that. But you can achieve this by overriding the get_permissions method:

from rest_framework.permissions import AllowAny, IsAdminUser

class UserViewSet(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer

    permission_classes_by_action = {'create': [AllowAny],
                                    'list': [IsAdminUser]}

    def create(self, request, *args, **kwargs):
        return super(UserViewSet, self).create(request, *args, **kwargs)

    def list(self, request, *args, **kwargs):
        return super(UserViewSet, self).list(request, *args, **kwargs)

    def get_permissions(self):
        try:
            # return permission_classes depending on `action` 
            return [permission() for permission in self.permission_classes_by_action[self.action]]
        except KeyError: 
            # action is not set return default permission_classes
            return [permission() for permission in self.permission_classes]

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