无法获取django声明的应用程序路由作为页面

Question

我正在创建Django应用，并且遇到无法识别路由的问题。这是我尝试创建的同一DJango民意测验应用程序，但文档代码不起作用。这是我的代码如下：

djangoproject/urls.py

from django.conf.urls import url, include
from django.contrib import admin

urlpatterns = [
    url(r'^simpleapp/', include('simpleapp.urls')),
    url(r'^admin/', admin.site.urls),
]

simpleapp/views.py

from django.shortcuts import render
from django.http import HttpResponse, request


def index(request):
    return HttpResponse("Hello, world. You're at the polls index.")

def detail(request, question_id):
    return HttpResponse("You're looking at question %s." % question_id)

def results(request, question_id):
    response = "You're looking at the results of question %s."
    return HttpResponse(response % question_id)

def vote(request, question_id):
    return HttpResponse("You're voting on question %s." % question_id)

simpleapp/urls.py

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

urlpatterns = [
    # ex: /simpleapp/
    # url('', views.index, name='index'),
    # ex: /simpleapp/5/
    url('<int:question_id>/', views.detail, name='detail'),
    # ex: /simpleapp/5/results/
    url('<int:question_id>/results/', views.results, name='results'),
    # ex: /simpleapp/5/vote/
    url('<int:question_id>/vote/', views.vote, name='vote'),
]

如果我取消注释simpleapp/urls.py代码的''路径的第一个URL，则显示的所有页面均为”路径。但是，如果我将url''路径保留为注释，则路由会给我以下错误：

Page not found (404)
Request Method: GET
Request URL:    http://127.0.0.1:8000/simpleapp/34/
Using the URLconf defined in simple_django.urls, Django tried these URL patterns, in this order:

^simpleapp/ <int:question_id>/ [name='detail']
^simpleapp/ <int:question_id>/results/ [name='results']
^simpleapp/ <int:question_id>/vote/ [name='vote']
^admin/
The current path, simpleapp/34/, 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.

我无法使用path()或django.conf.urls导入django.urls。 url()成功。我正在使用python版本3.6.7和Django版本2.1.5。我想念什么？

Answer 1

您在simpleapp / urls.py中使用的是路径语法，而不是正则表达式。更改为：

urlpatterns = [
  path('<int:question_id>/', views.detail, name='detail'),
  path('<int:question_id>/results/', views.results, name='results'),
  path('<int:question_id>/vote/', views.vote, name='vote'),
]

您的项目URL使用的是正则表达式，尽管您可能希望使它们保持一致，但您不应更改它们。

Answer 2

您定义诸如 Django 1.x

之类的路由

url(r'^simpleapp/', include('simpleapp.urls')),
url(r'^admin/', admin.site.urls),

这是Django 1.x类型的路由定义

在Django 2中，您必须定义如下路由：

from django.contrib import admin
from django.urls import include, path

urlpatterns = [
    path('polls/', include('polls.urls')),
    path('admin/', admin.site.urls),
]

在Django 2中，路由定义时不使用正则表达式

有关在 Django 2

中定义路线的信息，请参阅文档