DjangoCMS 教程上的 NoReverseMatch 错误:插件

NoReverseMatch error on DjangoCMS Tutorial: Plugins

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

到目前为止一切都很好,但是当我尝试将轮询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 <form action="{% url 'polls:vote' 'instance.poll.id' %}" method="post">

投票应用urls.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'),)

迁移顺利,Poll 插件显示在插件列表中,甚至 select 插件对象的弹出窗口也打开得很好。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。

我也试过把instance.poll.id放在单引号里面,但是我得到了同样的错误。 请帮我。谢谢!

这一定是因为您试图向不存在的轮询实例显示 link。我的意思是,在您的模板中:

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

我打赌你的 instance.poll.id 是 None,因此 django 找不到任何合适的 urlconf(如你所见,r'^(?P\d+)/vote/ $' 要求 至少一个 数字作为参数)。作为测试:您可以通过注释掉该行并仅显示 {{ instance.poll }} 再试一次吗?它是否显示任何内容?

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