django--视图函数的包装（Wrapping view function）

下边的代码包含很多重复的代码：

def my_view1(request):
if not request.user.is_authenticated():
return HttpResponseRedirect('/accounts/login/')
# ...
return render_to_response('template1.html')

def my_view2(request):
if not request.user.is_authenticated():
return HttpResponseRedirect('/accounts/login/')
# ...
return render_to_response('template2.html')

def my_view3(request):
if not request.user.is_authenticated():
return HttpResponseRedirect('/accounts/login/')
# ...
return render_to_response('template3.html')

每个视图都要检查用户是否已经认证，未认证会被重定向到/accounts/login/，我们可以这样：

def requires_login(view):
def new_view(request, *args, **kwargs):
if not request.user.is_authenticated():
return HttpResponseRedirect('/accounts/login/')
return view(request, *args, **kwargs)
return new_view

这样就可以在URLconf中直接使用requires_login来包装实现：

from django.conf.urls.defaults import *
from mysite.views import requires_login, my_view1, my_view2, my_view3

urlpatterns = patterns('',
(r'^view1/$', requires_login(my_view1)),
(r'^view2/$', requires_login(my_view2)),
(r'^view3/$', requires_login(my_view3)),
)