old_contents: from django.shortcuts import get_object_or_404, render_to_response
  from django.http import HttpResponseRedirect, HttpResponse
  from django.core.urlresolvers import reverse
  from django.template import RequestContext
  from polls.models import Choice, Poll
  
  
  def vote(request, poll_id):
      p = get_object_or_404(Poll, pk=poll_id)
      try:
          selected_choice = p.choice_set.get(pk=request.POST['choice'])
      except (KeyError, Choice.DoesNotExist):
          # Redisplay the poll voting form.
          return render_to_response('polls/detail.html', {
              'poll': p,
              'error_message': "You didn't select a choice.",
          }, context_instance=RequestContext(request))
      else:
          selected_choice.votes += 1
          selected_choice.save()
          # Always return an HttpResponseRedirect after successfully dealing
          # with POST data. This prevents data from being posted twice if a
          # user hits the Back button.
          return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))
  
new_contents: from django.shortcuts import get_object_or_404, render_to_response
  from django.http import HttpResponseRedirect, HttpResponse
  from django.core.urlresolvers import reverse
  from django.template import RequestContext
  from polls.models import Choice, Poll
  
  
  def vote(request, poll_id):
      p = get_object_or_404(Poll, pk=poll_id)
      try:
          selected_choice = Choice.objects.get(poll_id=p.pk, pk=request.POST['choice'])
      except (KeyError, Choice.DoesNotExist):
          # Redisplay the poll voting form.
          return render_to_response('polls/detail.html', {
              'poll': p,
              'error_message': "You didn't select a choice.",
          }, context_instance=RequestContext(request))
      else:
          Choice.objects.filter(pk=pk, poll_id=p.pk).update(votes=F('votes') + 1)
          # Always return an HttpResponseRedirect after successfully dealing
          # with POST data. This prevents data from being posted twice if a
          # user hits the Back button.
          return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))
  
subject: Fix vote view to work with sharded Choice