DjangoCMS教程:插件上的NoReverseMatch错误

时间:2015-10-27 22:32:35

标签: python django python-2.7 django-cms

我在做DjangoCMS教程:http://django-cms.readthedocs.org/en/latest/introduction/plugins.html

在此之前一切都很好,但是当我尝试将Poll插件添加到某个占位符时出现以下错误:

Reverse for 'vote' with arguments '('',)' and keyword arguments '{}' not found. 1 pattern(s) tried: ['en/polls/(?P<poll_id>\\d+)/vote/$']

模板:

<h1>{{ instance.poll.question }}</h1>
<form action="{% url 'polls:vote' instance.poll.id %}" method="post">
{% csrf_token %}
<div class="form-group">
    {% for choice in instance.poll.choice_set.all %}
        <div class="radio">
            <label>
                <input type="radio" name="choice" value="{{ choice.id }}">
                {{ choice.choice_text }}
            </label>
        </div>
    {% endfor %}
</div>
<input type="submit" value="Vote" />

观点:

class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_poll_list'

    def get_queryset(self):
        return Poll.objects.all()[:5]


class DetailView(generic.DetailView):
    model = Poll
    template_name = 'polls/detail.html'


class ResultsView(generic.DetailView):
    model = Poll
    template_name = 'polls/results.html'


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(request, 'polls/detail.html', {
            'poll': p,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))

错误发生在第<form action="{% url 'polls:vote' 'instance.poll.id' %}" method="post">

投票应用的u​​rls.py:

urlpatterns = patterns('',
    url(r'^$', views.IndexView.as_view(), name='index'),
    url(r'^(?P<pk>\d+)/$', views.DetailView.as_view(), name='detail'),
    url(r'^(?P<pk>\d+)/results/$', views.ResultsView.as_view(), name='results'),
    url(r'^(?P<poll_id>\d+)/vote/$', views.vote, name='vote'),)

迁移正常,Poll插件显示在插件列表中,甚至弹出选择插件对象打开不错。当我添加插件并确认时,网页崩溃了。要让网站再次打开,我需要手动删除/ admin上的页面。

我也尝试将instance.poll.id放在单引号中,但是我得到了同样的错误。 请帮我。谢谢!

1 个答案:

答案 0 :(得分:1)

这一定是因为您正在尝试显示指向不存在的轮询实例的链接。我的意思是,在你的模板中:

{{1}}

我打赌你的instance.poll.id是None,因此django找不到任何合适的urlconf(你可以看到,r'^(?P \ d +)/ vote / $'至少要求一个数字作为参数)。作为测试:您可以再次尝试,通过注释掉该行并显示{{instance.poll}}吗?是否显示任何内容?

解决方案:在尝试显示插件之前,必须将有效值设置为instance.poll。