retrieve resource name from request

I was wondering if there is any way for retrieving the resource name from the request.
Suppose I have the following resource definition in my routes.rb file:

map.resources :pages, :controller => 'documents'

now, when the url /pages/ is requested with the GET method, the method 'index' in the DocumentsController will be called and the resource name I would like to retrieve is :pages

I know I could probably do this from the URI, but in case the :as option is used it wouldn't work anymore:

map.resources :pages, :controller => 'documents', :as => 'foo'

Now, when the url /foo/ is called, the method index in the DocumentsController will be also called but the resource name should still be :pages

Any hint?

I looked at the ActionController::Routes classes but didn't find anything useful...

Thanks in advance