python - Django 显示页面未找到

Question

我正在学习 Python 速成类(class)中的第 18 章 18.4.2，当我打开 http://localhost:8000/topics 时，我正在使用 Django 3.0 和 python 3.8 显示

Page not found (404)
Request Method: GET
Request URL:    http://localhost:8000/topics
Using the URLconf defined in learning_log.urls, Django tried these URL patterns, in this order:

admin/
[name='index']
The current path, topics, didn't match any of these.

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.

这是我的代码 学习日志\urls.py

from django.contrib import admin
from django.urls import path
from learning_logs import views


urlpatterns = [
    path('admin/', admin.site.urls),
    path('',views.index,name = 'index')
]

学习日志\urls.py

from django.conf.urls import url
from . import views

urlpatterns = [

    url(r'^$',views.index,name = 'index'),

    url(r'^topics/$',views.topics,name='topics')
]

View .py

from django.shortcuts import render

from .models import Topic
# Create your views here.
def index(request):

    return render(request,'learning_logs/index.html')

def topics(request):

    topics = Topic.objects.order_by('date_added')
    context = {'topics':topics}
    return render(request,'learning_logs/topics.html',context)

base.html

<p>
    <a href="{% url 'learning_logs:index' %}">Learning Log</a>- 
    <a href="{% url 'learning_logs:topics'%}">Topics</a>
</p>

{% block content %}{% endblock content %}

主题.html

{% extends "learning_logs/base.html" %}

{% block content %}
    <p>Topics</p>
        <ul>
            {% for topic in topics %}
                <li>{{ topic }}</li>
                {% empty %}
                <li>No topics have been added yet.</li>
            {% endfor %}
        </ul>
{% endblock content %}

并且运行服务器显示:

Not Found: /topics
[06/Jan/2020 17:53:15] "GET /topics HTTP/1.1" 404 2077

enter image description here

Answer 1

首先，这是个好问题。喜欢细节。

错误如下

Using the URLconf defined in learning_log.urls, Django tried these URL patterns, in this order

这意味着无法找到网址/topics。您需要将该 url 从应用程序特定的 urls.py 导入到主 urls.py 中。这通常是通过类似

的方式来完成的

# in main urls.py
from learning_logs.urls import urlpatterns as ll_urlpatterns
# other patterns ...
urlpatterns += ll_urlpatterns