Compress RailsBaseURI and controller into one path segment?

I would like to deploy a simple rest application via mod_passenger to a sub-directory (RailsBaseURI) called /mailing_lists. The application is very simple mand has a single top-level resource called mailing_lists and sub-resources of subscribers:

  map.resources :mailing_lists, :path_prefix => nil do |mailing_lists|           mailing_lists.resource :subscriber, :only => [ :create, :new ]   end

$ rake routes new_mailing_list_subscriber GET /mailing_lists/:mailing_list_id/subscriber/new(.:format) {:controller=>"subscribers", :action=>"new"}     mailing_list_subscriber POST /mailing_lists/:mailing_list_id/subscriber(.:format) {:controller=>"subscribers", :action=>"create"}               mailing_lists GET /mailing_lists(.:format) {:controller=>"mailing_lists", :action=>"index"}                             POST /mailing_lists(.:format) {:controller=>"mailing_lists", :action=>"create"}            new_mailing_list GET /mailing_lists/new(.:format) {:controller=>"mailing_lists", :action=>"new"}           edit_mailing_list GET /mailing_lists/:id/edit(.:format) {:controller=>"mailing_lists", :action=>"edit"}                mailing_list GET /mailing_lists/:id(.:format) {:controller=>"mailing_lists", :action=>"show"}                             PUT /mailing_lists/:id(.:format) {:controller=>"mailing_lists", :action=>"update"}                             DELETE /mailing_lists/:id(.:format) {:controller=>"mailing_lists", :action=>"destroy"}

This means the resulting URIs with the /mailing_lists path segment duplicated like this:

/mailing_lists/mailing_lists/...

but I would like really to compress the first two path elements for the base uri and top-level controller into one. I tried :as => nil and :as => '' which is respectively ignored generates paths that do not actually work.

Any ideas?

/Allan