Question

我正在通过浏览Django教程创建一个网站。我收到了一个错误， NoReverseMatch at / polls / 反向找不到“细节”。 'detail'不是有效的视图函数或模式名称。它被告知像

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第0行。 base.html（位于模板文件夹中）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>

index.html（它在民意调查中）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 %}

'detail'表示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>

我认为错误消息意味着index.html无法加载detail.html。所以，我想这样做，但我不知道怎么做。我应该在index.html的第0行写一些东西吗？

民意调查中的

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()

民意调查中的

urls.py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？

Answer 1

你有一个错字：

<a href="{% url 'polls:detail' question.pk %}">

到

<a href="{% url 'polls:poll_detail' question.pk %}">
 <!--                 ^^^^^^^  -->

Answer 2

{% url %}接收urlpatterns中定义的网址名称，最终对应于一个视图。这与detail.html是否存在无关，您无法直接链接到detail.html，因为您需要一个说明如何呈现它的视图。

使用{% url 'poll_detail' ... %}，因为这就是您为视图命名的方式。

请参阅此处的文档：https://docs.djangoproject.com/en/1.11/ref/templates/builtins/#url

Answer 3

<td><a href="{% url 'polls:detail' question.pk %}">詳細画面へ</a></td>

您必须修改djangostudy中的urls.py才能使用

指定urls.py中指定的命名空间或使用polls / urls.py中指定的名称“poll_detail”

请注意，民意调查：这被指定为名称空间，而poll_detail由名称指定。

NoReverseMatch at / polls /为什么错误发生在第0行？

3 个答案: