- 如果没有使用reverse()之前的路由，只要在urls.py修改了匹配的pattern，那么很多地方调用了该url的代码都要修改，可谓是牵一发而动全身。 reverse()就是用来改善这种情况的。
2.Django配置 a.配置django工程:
django-admin startproject send_mail_prj
cd send_mail_prj
django-admin startapp app01
b.在项目的settings.py注册app01
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'app01.apps.App01Config', # 建议使用该方式注册，当然也可以直接是'app01'
]
c.在应用里创建urls.py文件
from django.conf.urls import url
from . import views
# 定义该app_name变量为应用名字
app_name = 'app01'
urlpatterns = [
url(r'register/$', views.register, name='register'),
url(r'index/$', views.register, name='index'), # name是别名
url(r'tiaozhuan/$', views.tiaozhuan, name='tiaozhuan')
]
d.在项目的urls.py文件中，include应用的url
from django.contrib import admin
from django.urls import path
from django.conf.urls import url, include
urlpatterns = [
path('admin/', admin.site.urls),
# 导入app.urls时 加入namespace是为了防止其他app.urls里面的name重复了
# 后续reverse获取url时，通过reverse('namespace:name')
url(r'^', include('app01.urls', namespace='app01')),
]
e.在应用视图中通过reverse()的方式来获取路由:
from django.shortcuts import render, redirect
from django.http import HttpRequest, HttpResponse
from celery_tasks.sms.tasks import sendEmail
from django.urls import reverse
def register(request):
# 发送邮件
sendEmail.delay()
return HttpResponse('hello')
def tiaozhuan(request):
# app01是名称空间；
# index 是在urls.py 里面的别名 url(r'index/$', views.register, name='index'),
path = reverse('app01:index')
print(path)
return redirect(path)
3.访问页面，测试实验
a.浏览器访问http://127.0.0.1/tiaozhuan 会跳转到http://127.0.0.1/index/
b.修改应用urls.py的路由patterns
from django.conf.urls import url
from . import views
app_name = 'app01'
urlpatterns = [
url(r'register/$', views.register, name='register'),
url(r'home/$', views.register, name='index'), # 修改为home
url(r'tiaozhuan/$', views.tiaozhuan, name='tiaozhuan')
]
c.继续浏览器测试
浏览器访问http://127.0.0.1/tiaozhuan 会跳转至 http://127.0.0.1/home/
结论: 测试完成，即使路由的匹配模式修改了，也不影响通过reverse()调用的URL
