为什么我会在“NoReverseMatch at /”错误？

Question

我获得下NoReverseMatch错误：

NoReverseMatch at/

Reverse for 'logout' not found. 'logout' is not a valid view function or pattern name. 

Request Method:  GET 
Request URL: http://127.0.0.1:8000/ 
Django Version:  1.11.3 
Exception Type:  NoReverseMatch 
Exception Value:  

Reverse for 'logout' not found. 'logout' is not a valid view function or pattern name. 

Exception Location:  /home/ivan/.local/lib/python2.7/site-packages/django/urls/resolvers.py in _reverse_with_prefix, line 497 
Python Executable: /usr/bin/python 
Python Version:  2.7.12 
Python Path:  

['/home/ivan/My_website/essostrade (copy 1)', 
'/usr/lib/python2.7', 
'/usr/lib/python2.7/plat-x86_64-linux-gnu', 
'/usr/lib/python2.7/lib-tk', 
'/usr/lib/python2.7/lib-old', 
'/usr/lib/python2.7/lib-dynload', 
'/home/ivan/.local/lib/python2.7/site-packages', 
'/usr/local/lib/python2.7/dist-packages', 
'/usr/lib/python2.7/dist-packages', 
'/usr/lib/python2.7/dist-packages/PILcompat', 
'/usr/lib/python2.7/dist-packages/gtk-2.0', 
'/usr/lib/python2.7/dist-packages/ubuntu-sso-client', 
'/usr/lib/python2.7/dist-packages/wx-3.0-gtk2'] 

Server time: Fri, 25 Aug 2017 22:51:14 +0000 

但问题是，有没有“注销”既不在突出main.js模板线，也不在别的地方模板。

这里是我的模板： main.html中：

{% extends "base.html" %} 
{% load staticfiles %} 
{% block additional_css %} 
    <link type="text/css" href="{% static "main.css" %}" rel="stylesheet"> 
{% endblock %} 
{% block content %} 
    <div id="header"> 
    <h1>Браавосская лавочка</h1> 
    </div> 
<!-- <div id="leftmenu"> 
    <ul> 
     {% url "main" as page_url %} 
     <li><a href="{{ page_url }}"{% if page_url == current_url %} class="current"{% endif %}>Главная</a></li> 
     {% if user.is_authenticated %} 
     <li class="indented"><a href="/admin/">Админка</a></li> 
     <li class="indented"><a href="{% url "logout" %}">Выйти</a></li> 
     {% endif %} 
    </ul> 
    </div> -->  
<div id="main"> 
    {% block main %} 
    {% endblock %} 
</div> 
<div id="footer"> 
    <p>Все права принадлежат Матери Драконов</p> 
</div> 
{% endblock %}  

mainpage.html：

{% extends "main.html" %} 
{% block title %}Главная страница{% endblock %} 
{% block main %} 
    <h2>Удивительные товары со всего Вестероса</h2> 
    <p>Фирма веников не вяжет, фирма делает гробы</p> 
{% endblock %} 

这里是我的views.py文件：

# -*- coding: utf-8 -*- 
from __future__ import unicode_literals 
from django.views.generic import TemplateView 
from generic.mixins import CategoryListMixin 
from django.shortcuts import render 
from django.contrib.auth import login, authenticate 
from django.contrib.auth.forms import UserCreationForm 
from django.shortcuts import render, redirect 
from django import forms 





class MainPageView(TemplateView, CategoryListMixin): 
    template_name = "mainpage.html" 





class LoginView(TemplateView): 
    template_name = "login_logout.html" 
    isLoggedIn = False 





class PageNumberMixin(CategoryListMixin): 
    def get_context_data(self, **kwargs): 
     context = super(PageNumberMixin, self).get_context_data(**kwargs) 
     try: 
      context["pn"] = self.request.GET["page"] 
     except KeyError: 
      context["pn"] = "1" 
     return context 





def signup(request): 
    if request.method == 'POST': 
     form = UserCreationForm(request.POST) 
     if form.is_valid(): 
      form.save() 
      username = form.cleaned_data.get('username') 
      raw_password = form.cleaned_data.get('password1') 
      user = authenticate(username=username, password=raw_password) 
      login(request, user) 
      return redirect('home') 
    else: 
     form = UserCreationForm() 
    return render(request, 'signup.html', {'form': form}) 

这里是我的urls.py文件：

from django.conf.urls import url 
from django.contrib import admin 
from django.conf import settings 
from django.conf.urls.static import static 
from django.conf.urls import include 
from main.views import LoginView, MainPageView 
from main.views import signup 

urlpatterns = [ 
    url(r'^admin/', admin.site.urls), 
    url(r'^$', MainPageView.as_view(), name='main'), 
    url(r'^signup/$', signup, name='signup'), 



] 

urlpatterns += static(settings.MEDIA_URL, document_root = settings.MEDIA_ROOT) 

我真的不知道这个'注销'出现在哪里。

Answer 1

您的main.html模板正在尝试反转URL注销，但您尚未为注销视图添加URL模式。

{% url "logout" %} 

from django.contrib.auth.views import LogoutView 

url(r'^logout/$', LogoutView.as_view(), name='logout'), 

你必须要么创建一个registration/logged_out.html模板来显示，或设置您的设置LOGOUT_REDIRECT_URL。