Django之URL的命名空间和命名模式

Django之URL的命名空间和命名模式
http://blog.csdn.net/xiaobing_blog/article/details/11003643
 

django URL模式浅析

http://blog.csdn.net/laughing2333/article/details/51674905

Namespacing URL names¶

The tutorial project has just one app, 

polls

. In real Django projects, there might
be five, ten, twenty apps or more. How does Django differentiate the URL names between them? For example, the 

polls

 app
has a 

detail

 view, and so might an app on the same project that is for a blog.
How does one make it so that Django knows which app view to create for a url when using the 

{% url %}

 template
tag?

The answer is to add namespaces to your URLconf. In the 

polls/urls.py

 file, go ahead
and add an 

app_name

 to set the application namespace:

polls/urls.py

from django.conf.urls import url

from . import views

app_name = 'polls'
urlpatterns = [
url(r'^$', views.index, name='index'),
url(r'^(?P<question_id>[0-9]+)/$', views.detail, name='detail'),
url(r'^(?P<question_id>[0-9]+)/results/$', views.results, name='results'),
url(r'^(?P<question_id>[0-9]+)/vote/$', views.vote, name='vote'),
]

Now change your 

polls/index.html

 template from:

polls/templates/polls/index.html

<li><a href="{% url 'detail' question.id %}">{{ question.question_text }}</a></li>

to point at the namespaced detail view:

polls/templates/polls/index.html

<li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>

xys友情提醒：
URL命名空间是用于模板文件中对URL（所谓URL是浏览器访问时的网络地址）的反向引用，一般会使用模板标签{% url %}
例如在index.html中
{% url 'polls:detail' question.id %}"这根模板文件的命名空间（其实质是本地的相对路径）不一样：模板文件的命名空间的应用场景是，在每个APP下建立appname/templates/appname/，然后在该目录下再放模板文件(index.html)。然后在需要引用模板文件的地方，采用模板文件相对地址硬编码时，形式如下：appname/index.html.
例如在views.py中
def index(request):
    #return HttpResponse("Hello, world. You're at the polls index.")
    return render(request,'polls/index.html')

或者index.html中
<li><a href="/polls/xxx.html">{{ question.question_text }}</a></li>