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,)))

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,)))

Fix vote view to work with sharded Choice
Fix vote view to work with sharded Choice

  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'])
+         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)
-         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,)))
  
Fix vote view to work with sharded Choice
## Code Before:
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,)))

## Instruction:
Fix vote view to work with sharded Choice
## Code After:
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,)))
