为什么我会收到“NoReverseMatch at /”错误？

Question

我收到下一个 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

但问题是模板中突出显示的 main.js 行中没有“注销”，模板中的其他地方也没有。

这是我的模板： main.html：

{% 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”是从哪里出现的。

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'),

您必须创建要显示的registration/logged_out.html 模板，或在您的设置中设置LOGOUT_REDIRECT_URL。