django - class based view store post data

Hello,

I am trying to use class based view to post data.

I have come across a weird issue. It is not saving data in the backend. I get an error:

Expected view AddToUserProfile to be called with a URL keyword argument named "pk". Fix your URL conf, or set the `.lookup_field` attribute on the view correctly. 

I have searched on google to see explanation on this error but could not understand the explanation. Appreciate if someone can shed some light on this.

Here is my model:

class UserPrefs(models.Model):
    Preferences = (
        (1,'Likes'),
        (1,'Dislikes'),
        (1,'Shared'),
        (1,'Rejected')
    )
    user = models.ForeignKey('auth.User', related_name='Hello')
    name = models.ForeignKey(Stock)
    value = models.CharField(max_length=20,choices=Preferences)

    class Meta:
        #managed = False
        db_table = 'user_pref'

    def save(self, *args, **kwargs):
        super(Hello, self).save(*args, **kwargs)

class AddToUserProfile(generics.GenericAPIView):
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,IsOwnerOrReadOnly)
    queryset = UserPrefs.objects.all()
    serializer_class = UserPrefSerializer
    lookup_fields = ('id')
    def get(self, request, *args, **kwargs):
        return HttpResponse('Hello there!')

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        context = self.get_context_data(object=self.object)
        #eturn self.render_to_response(context)
    def create(self, serializer):
        serializer.save(owner=self.request.user)

Serializer code:

class UserPrefSerializer(serializers.ModelSerializer):
    owner = serializers.ReadOnlyField(source='owner.username')
    class Meta:
        model = UserPrefs
        fields = ( 'owner', 'name', 'value')
        depth = 1

Url.py entry:
url(r'^Hello/setPrefs', views.AddToUserProfile.as_view()),

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