代码改变世界

Django的url规则

2016-03-23 15:43  TRACEING  阅读(2265)  评论(0编辑  收藏  举报

利用Django开发网站,可以设计出非常优美的url规则,如果url的匹配规则(包含正则表达式)组织得比较好,view的结构就会比较清晰,比较容易维护。
最简单的形式
[python] view plain copy print?
<code>  
from django.conf.urls import patterns, url  
urlpatterns = patterns('',  
    url(r'^articles/2003/$', 'news.views.special_case_2003'),  
    url(r'^articles/(\d{4})/$', 'news.views.year_archive'),  
    url(r'^articles/(\d{4})/(\d{2})/$', 'news.views.month_archive'),  
    url(r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'news.views.article_detail'),  
)</code>  
其中,正则表达式中组匹配出来的结果可以作为positional parameters传递给view.
如果url是www.yourdomain/articles/2005/,则会匹配第二条规则,执行news.views.year_archive('2005').
注意点
域名部分会被过滤掉
articles的前面不需要添加/,因为前序url的末尾一定会有/
任何组匹配的变量,都会议字符串的形式传递给view, 虽然通过(\d{4})匹配出了2005,但2005任然会被当做字符串传递给year_archive
利用named group来传递参数
可以通过以下形式为特定的组指定一个名称.
[python] view plain copy print?
urlpatterns = patterns('',  
    url(r'^articles/2003/$', 'news.views.special_case_2003'),  
    url(r'^articles/(?P<year>\d{4})/$', 'news.views.year_archive'),  
    url(r'^articles/(?P<year>\d{4})/(?P<month>\d{2})/$', 'news.views.month_archive'),  
    url(r'^articles/(?P<year>\d{4})/(?P<month>\d{2})/(?P<day>\d{2})/$', 'news.views.article_detail'),  
)  

这样的话,组的匹配结果会通过keyword parameters的形式传递给view.例如year_archive(year='2005')

利用named group可以为view指定一个默认参数来匹配多条规则。
[python] view plain copy print?
# URLconf  
from django.conf.urls import patterns, url  
  
urlpatterns = patterns('',  
    url(r'^blog/$', 'blog.views.page'),  
    url(r'^blog/page(?P<num>\d+)/$', 'blog.views.page'),  
)  
  
# View (in blog/views.py)  
def page(request, num="1"):  
    # Output the appropriate page of blog entries, according to num.  


指定view前缀(提取公因式)
patterns函数的第一个参数即是view的前缀
[python] view plain copy print?
from django.conf.urls import patterns, url  
  
urlpatterns = patterns('news.views',  
    url(r'^articles/(\d{4})/$', 'year_archive'),  
    url(r'^articles/(\d{4})/(\d{2})/$', 'month_archive'),  
    url(r'^articles/(\d{4})/(\d{2})/(\d+)/$', 'article_detail'),  
)  
指定多个view前缀
[python] view plain copy print?
urlpatterns = patterns('myapp.views',  
    url(r'^$', 'app_index'),  
    url(r'^(?P<year>\d{4})/(?P<month>[a-z]{3})/$','month_display'),  
)  
urlpatterns += patterns('weblog.views',  
    url(r'^tag/(?P<tag>\w+)/$', 'tag'),  
)  

include其它匹配模块
[python] view plain copy print?
from django.conf.urls import include, patterns, url  
  
urlpatterns = patterns('',  
    # ... snip ...  
    url(r'^comments/', include('django.contrib.comments.urls')),  
    url(r'^community/', include('django_website.aggregator.urls')),  
    url(r'^contact/', include('django_website.contact.urls')),  
    # ... snip ...  
)  
当然也可以直接include其它patterns
[python] view plain copy print?
from django.conf.urls import include, patterns, url  
  
extra_patterns = patterns('',  
    url(r'^reports/(?P<id>\d+)/$', 'credit.views.report'),  
    url(r'^charge/$', 'credit.views.charge'),  
)  
  
urlpatterns = patterns('',  
    url(r'^$', 'apps.main.views.homepage'),  
    url(r'^help/', include('apps.help.urls')),  
    url(r'^credit/', include(extra_patterns)),  
)  

为view函数传递额外参数
[python] view plain copy print?
from django.conf.urls import patterns, url  
  
urlpatterns = patterns('blog.views',  
    url(r'^blog/(?P<year>\d{4})/$', 'year_archive', {'foo': 'bar'}),  
)  
直接使用view函数
[python] view plain copy print?
from django.conf.urls import patterns, url  
from mysite.views import archive, about, contact  
  
urlpatterns = patterns('',  
    url(r'^archive/$', archive),  
    url(r'^about/$', about),  
    url(r'^contact/$', contact),  
)