Source

JythonBook / src / chapter14 / tour / pollsite / polls / views.py

from django.shortcuts import get_object_or_404, render_to_response
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from pollsite.polls.models import Choice, Poll

def index(request):
    latest_poll_list = Poll.objects.all().order_by('-pub_date')[:5]
    return render_to_response('polls/index.html', {'latest_poll_list': latest_poll_list})

def detail(request, poll_id):
    poll = get_object_or_404(Poll, pk=poll_id)
    return render_to_response('polls/detail.html', {'poll': poll})

def vote(request, poll_id):
    poll = get_object_or_404(Poll, pk=poll_id)
    try:
        selected_choice = poll.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the poll voting form.
        return render_to_response('polls/detail.html', {
            'poll': poll,
            'error_message': "You didn't select a choice.",
        })
    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('pollsite.polls.views.results', args=(poll.id,)))

def results(request, poll_id):
    poll = get_object_or_404(Poll, pk=poll_id)
    return render_to_response('polls/results.html', {'poll': poll})