Django - Accessing model from django.contrib's User class via ManyToManyKey - django

Question

I am making a Hacker News Clone in Django as taught in a Tuts+ Course [Git Repo]
In views.py file, for vote view, I tried using this code to increase security by checking if user has liked the story already.
#login_required
def vote(request):
story = get_object_or_404(Story, pk=request.POST.get('story'))
user = request.user
if user.is_authenticated() and story not in user.liked_stories:
story.points += 1
story.save()
user.liked_stories.add(story)
user.save()
return HttpResponse()
But it gives me this Error:
NameError: global name 'liked_stories' is not defined
[18/Aug/2013 19:26:43] "POST /vote/ HTTP/1.1" 500 11148
I am able to use user.liked_stories in index view so why not in vote view?
Error:
Internal Server Error: /vote/
Traceback (most recent call last):
File "/home/sourabh/.virtualenvs/django/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 115, in get_response
response = callback(request, *callback_args, **callback_kwargs)
File "/home/sourabh/.virtualenvs/django/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 25, in _wrapped_view
return view_func(request, *args, **kwargs)
File "/home/sourabh/Code/django_apps/HackerNews/stories/views.py", line 53, in vote
if user.is_authenticated() and story not in liked_stories:
NameError: global name 'liked_stories' is not defined
[18/Aug/2013 20:08:35] "POST /vote/ HTTP/1.1" 500 11161

Answer 1

There you go:
if user.is_authenticated() and story not in liked_stories:
In this line the error is thrown. The code you have posted does not resemble the code you are executing.