Django(命名空间)

Posted 2021-01-06 mjiu

 

命名空间

命名空间（英语：Namespace）是表示标识符的可见范围。一个标识符可在多个命名空间中定义，它在不同命名空间中的含义是互不相干的。这样，在一个新的命名空间中可定义任何标识符，它们不会与任何已有的标识符发生冲突，因为已有的定义都处于其它命名空间中。 由于name没有作用域，Django在反解URL时，会在项目全局顺序搜索，当查找到第一个name指定URL时，立即返回 我们在开发项目时，会经常使用name属性反解出URL，当不小心在不同的app的urls中定义相同的name时，可能会导致URL反解错误，为了避免这种事情发生，引入了命名空间。

 

项目urls.py

from django.urls import path
from  myapp import views
from  django.conf.urls.static import static
from  django.conf import settings
from  django.conf.urls import re_path,include
from  myapp import *
from  myapp02 import *
urlpatterns  = [
    # path(‘admin/‘, admin.site.urls),
    path(‘hello/‘,views.hello),
    path(‘login/‘,views.login,name =‘Log‘ ),
    re_path(r"^myapp/",include(("myapp.urls","myapp"))), #这里记住是元组，然后后面是名称
    re_path(r"^myapp02/",include(("myapp02.urls","myapp02"))),

]+ static(settings.STATIC_URL,document_root=settings.STATIC_ROOT)

 

app1 urls.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from  django.conf.urls import url
from myapp import views
from  django.urls import re_path
urlpatterns  = [

    re_path(r‘^index/‘,views.index,name=‘index‘),
    url(r‘^hello/([0-9]{4})/$‘, views.year_archive,name=‘y‘),
    url(r‘^hello/([0-9]{4})/([0-9]{2})/$‘, views.month_archive),
    url(r‘^hello/([0-9]{4})/([0-9]{2})/([0-9]+)/$‘, views.article_detail),
]

app1 views.py

from django.shortcuts import render
from django.http import HttpResponse
from  django.urls import reverse
# Create your views here.
# request 是固定写法
def index(request):
    return HttpResponse(reverse("myapp:index"))

app2 urls.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from myapp02 import views
from  django.urls import re_path
urlpatterns  = [

    re_path(r‘^index/‘,views.index,name=‘index‘),
    ]

 

app2 views.py

from django.http import HttpResponse
from  django.urls import reverse
def index(request):
    return HttpResponse(reverse("myapp02:index"))