Django(part4)

{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
 <form action="{% url 'polls:vote' question.id %}" method="post"> 

{% csrf_token %} 
{% for choice in question.choice_set.all %} 
<input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}" /> 
<label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br /> 

{% endfor %} 
<input type="submit" value="Vote" /> 
</form>

#polls/urls.pyurl(r'^(?P<question_id>/d+)/vote/$', views.vote, name='vote'),#polls/views.pyfrom django.shortcuts import get_object_or_404, renderfrom django.http import HttPResponseRedirect, HttpResponsefrom django.core.urlresolvers import reversefrom polls.models import Choice, Question# ...def vote(request, question_id):    p = get_object_or_404(Question, pk=question_id)    try:        selected_choice = p.choice_set.get(pk=request.POST['choice'])    except (KeyError, Choice.DoesNotExist):        # Redisplay the question voting form.        return render(request, 'polls/detail.html', {            'question': p,            '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('polls:results', args=(p.id,)))

# polls/view.py

from  django.shortcuts import get_object_or_404, renderdef results(request, question_id):    question = get_object_or_404(Question, pk=question_id)    return render(request, 'polls/results.html', {'question': question})

from django.shortcuts import get_object_or_404, renderfrom django.http import HttpResponseRedirectfrom django.core.urlresolvers import reversefrom django.views import genericfrom polls.models import Choice, Questionclass IndexView(generic.ListView):    template_name = 'polls/index.html'    context_object_name = 'latest_question_list'    def get_queryset(self):        """Return the last five published questions."""        return Question.objects.order_by('-pub_date')[:5]class DetailView(generic.DetailView):    model = Question#template_name 告诉django自动生成的template的name#如果不指定默认为<app name>/<model name>_detail.html    template_name = 'polls/detail.html'#polls/urls.py#注意必须用<pk>指定匹配的组名urlpatterns = patterns('',    url(r'^$', views.IndexView.as_view(), name='index'),    url(r'^(?P<pk>/d+)/$', views.DetailView.as_view(), name='detail'),  )

#polls/templates/polls/index.html{% load staticfiles %}<link rel="stylesheet" type="text/css" href="{% static 'polls/style.css' %}" />