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我正在通过看Django tutorial.I出错， NoReverseMatch/polls/ 找不到'detail'。 'detail'不是有效的视图函数或模式名称。有人说像NoReverseMatch at/polls /为什么错误发生在第0行？
Error during template rendering
In template /Users/xxx/djangostudy/templates/base.html, error at line 0
Reverse for 'detail' not found. 'detail' is not a valid view function or pattern name.
我真的不明白为什么错误发生在0行 base.html文件（这是在模板文件夹）是
{% load staticfiles %}
{% load bootstrap3 %}
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="../../favicon.ico">
<title>Starter Template for Bootstrap</title>
<!-- Bootstrap core CSS -->
<link href="{% static 'css/bootstrap.min.css' %}" rel="stylesheet">
<style type="text/css">
body {
padding-top: 50px;
}
</style>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="{% url 'index' %}">Tutorial</a>
</div>
<div id="navbar" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="{% block nav_polls %}{% endblock %}"><a href="{% url 'polls:index' %}">polls</a></li>
<li class=""><a href="{% url 'admin:index' %}">admin</a></li>
</ul>
</div><!--/.nav-collapse -->
</div>
</nav>
<div class="container">
{% bootstrap_messages messages %}
{% block contents %}{% endblock %}
</div><!-- /.container -->
<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="../../assets/js/vendor/jquery.min.js"><\/script>')</script>
<script src="{% static 'js/bootstrap.min.js' %}"></script>
</body>
</html>
的index.html（它在民意调查）是
{% extends "polls/base.html" %}
{% load staticfiles %}
{% block contents %}
<table border="1" class="table table-striped">
<tr>
<th>質問内容</th>
<th>公開日</th>
<th></th>
</tr>
{% for question in questions %}
<tr>
<td>{{ question.question_text }}</td>
<td>{{ question.pub_date }}</td>
<td><a href="{% url 'polls:detail' question.pk %}">詳細画面へ</a></td>
</tr>
{% endfor %}
</table>
{% endblock contents %}
'细节' 是指detail.html，它是
<!DOCTYPE html>
<h1>{{ question.question_text }}</h1>
{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
<form action="{% url 'poll_vote' question.id %}" method="post">
{% csrf_token %}
{{ form }}
<input type="submit" value="Vote" />
</form>
</html>
我想错误消息意味着index.html无法加载detail.html.So，我想这样做，但我不怎么做它。我应该在index.html的第0行写什么？在民意调查
views.py是
from django.shortcuts import render
from django.urls import reverse_lazy
from django.utils.html import mark_safe
from .models import Question
from django.http import HttpResponse
from django.shortcuts import Http404
from django.shortcuts import get_object_or_404,redirect
from .models import Choice
from django.views.generic import TemplateView
from django.views.generic import DetailView
from django.views.generic import ListView
from .forms import MyForm
from .forms import VoteForm
from django.views.generic import FormView
from django.views.generic.detail import SingleObjectMixin
from django.shortcuts import resolve_url
# Create your views here.
def index(request):
return render(request,'polls/index.html',{
'questions': Question.objects.all(),
})
# def detail(request,pk):
# obj = get_object_or_404(Question,pk=pk)
# if request.method == "POST":
# form = VoteForm(question=obj,data=request.POST)
# if form.is_valid():
# form.vote()
# return redirect('polls:results',pk)
# else:
# form = VoteForm(question=obj)
# return render(request,'polls/detail.html',{
# 'form':form,
# 'question': obj,
# })
def vote(request,pk):
question = get_object_or_404(Question,pk=pk)
try:
selected_choice = question.choice_set.get(pk=request.POST['choice'])
except (KeyError,Choice.DoesNotExist):
return render(request,'poll/detail.html',{
'question':question,
'error_message':"You didn't select a choice",
})
else:
selected_choice.votes += 1
selected_choice.save()
return redirect('index')
return redirect('poll_results', pk)
# pass
def results(request,pk):
obj = get_object_or_404(Question,pk=pk)
return render(request,'polls/results.html',{
'question':obj,
})
class FormTest(FormView):
form_class = MyForm
template_name = 'polls/form.html'
success_url = reverse_lazy('polls:index')
form_test = FormTest.as_view()
class Detail(SingleObjectMixin,FormView):
model = Question
form_class = VoteForm
context_object_name = 'question'
template_name = 'polls/detail.html'
def get(self, request, *args, **kwargs):
self.object = self.get_object()
return super().post(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
self.object = self.get_object()
return super().post(request, *args, **kwargs)
def get_form_kwargs(self):
kwargs = super().get_form_kwargs()
kwargs['question'] = self.object
return kwargs
def form_valid(self, form):
form.vote()
return super().form_valid(form)
def get_success_url(self):
return resolve_url('polls:results',self.kwargs['pk'])
detail = Detail.as_view()
urls.py在民调是
from django.conf.urls import url
from django.views.generic import TemplateView
from . import views
app_name="polls"
urlpatterns = [
url(r'(?P<pk>\d+)/$', views.detail, name='poll_detail'),
url(r'(?P<pk>\d+)/vote$', views.vote, name='poll_vote'),
url(r'(?P<pk>\d+)/results$', views.results, name='poll_results'),
url(r'^$',views.index,name='index'),
url(r'^form$', views.form_test),
]
目录是 
我该如何解决这个问题？