Singular resources namespaced by its slug (Routing)

Hi,

I have the followed Rails 3 routes:

    Hello::Application.routes.draw do
      resources :blogs do
        resources :articles do
          resources :comments
        end
      end
    end

By raking them, we can find (for instance):

    GET /blogs/:blog_id/articles(.:format) {:action=>"index",
:controller=>"articles"}

Because every routes begin with the same root path (*/blogs*), I would
like to shorten addresses by removing it (when :blog_id is given).

In this why, I could have thoses routes (I think it's more DRY):

    GET /:blog_id/articles(.:format) {:action=>"index",
:controller=>"articles"}

According to you, what kind of change I should make over my current
routes configuration?

Thanks.