Rails route example that shows map.root (2.3.x)

routes.rb

ActionController::Routing::Routes.draw do |map|
  map.resources :posts
  map.resources :customers
  map.resources :password_resets
  map.resource :account, :controller => "users"
  map.resources :users
  map.resource :user_session
  map.login 'login', :controller => "user_sessions", :action => "new"
  map.logout 'logout', :controller => "user_sessions", :action => "destroy"
  map.root :controller => "posts", :action => "index"
end