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我正在通過看Django tutorial.I出錯， NoReverseMatch/polls/ 找不到'detail'。 'detail'不是有效的視圖函數或模式名稱。有人說像NoReverseMatch at/polls /爲什麼錯誤發生在第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.
我真的不明白爲什麼錯誤發生在0行 base.html文件（這是在模板文件夾）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（它在民意調查）是
{% extends "polls/base.html" %}
{% load staticfiles %}
{% block contents %}
<table border="1" class="table table-striped">
<tr>
<th>質問內容</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 %}">詳細畫面へ</a></td>
</tr>
{% endfor %}
</table>
{% endblock contents %}
'細節' 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>
我想錯誤消息意味着index.html無法加載detail.html.So，我想這樣做，但我不怎麼做它。我應該在index.html的第0行寫什麼？在民意調查
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在民調是
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),
]
目錄是 
我該如何解決這個問題？