Give that I have a model called Apple and it has a controller ApplesController, the routes are:
Apple
ApplesController
resources :apples apples GET
What you will want to do is pass in the :path option
:path
resources :apples, :path => "cars"
This replace all your route references with /apples to /cars
/apples
/cars
See: http://guides.rubyonrails.org/routing.html, Section 4.7 Translating Paths