The url config of my app currently looks like this:

from django.conf.urls.defaults import patterns
from django.views.generic.simple import redirect_to

urlpatterns = patterns("myapp.views",
    (r"^$", redirect_to, {"url": "main/"}),
    (r"^(?P<title>.+)/$", "article"),
    ...
)

This works fine whe开发者_开发问答n the app’s urls are used without prefix.

Now, i want to include my app’s urls into a project’s url config with a prefix; like this:

urlpatterns = patterns("",
    (r"^myapp/", include("myapp.urls")),
)

But then http://myserver.org/myapp/ isn’t redirected to http://myserver.org/myapp/main/, but to http://myserver.org/main/.

I think I understand how it works: The project’s url patterns get "myapp/". This matches the prefix, which is stripped away, leaving "", which is passed to the app’s patterns. The app is agnostic about the stripping and just redirects to main/, which Django interprets as /main/which doesn’t work for deeper nested urls (see edit below).

How to tell Django to redirect to a URL relative to the app’s prefix?

Edit: Mistake!

Aah! Above code works fine, but my browser cached the permanent redirect to the previous url, which was "/main/". I cleared my cache and my new url "main/" (which is now now temporary to prevent caching) Works just fine. Sorry!

But I realized that a answer would be helpful when I want to go to a url relative to the app’s root from a deeper nesting: "relative/" may work for http://myserver.org/myapp/foo/, but not for http://myserver.org/myapp/foo/bar/.

In django 1.4 you will be able to use the function reverse_lazy():

from django.core.urlresolvers import reverse_lazy
urlpatterns = patterns("myapp.views",
    (r"^$", redirect_to, {"url": reverse_lazy("myapp_title")}),
    (r"^(?P<title>.+)/$", "article", name="myapp_title"),
    ...
)

reverse_lazy() resolves to the URL which was given the same string as "name" parameter that is provided as an argument to reverse_lazy().

If you are working with an earlier version, that you will have to specify the full path, which, of course, violates the DRY principle:

(r"^$", redirect_to, {"url": "myapp/title/"}),