Routes, for comment in http://blog.coryfoy.com/2014/05/start-with-expressiveness/

routes

                   Prefix Verb   URI Pattern                         Controller#Action
                     root GET    /                                   courses#index
                   course GET    /courses/:id(.:format)              courses#show
      invitation_required GET    /invitation-required(.:format)      site#invitation_required
               enrollment POST   /enrollment(.:format)               enrollment#create
             payment_plan GET    /enrollment/payment-plan(.:format)  enrollment#edit_payment_plan
  enrollment_payment_plan PUT    /enrollment/payment-plan(.:format)  enrollment#create_payment_plan
                          PATCH  /enrollment/payment-plan(.:format)  enrollment#create_payment_plan
enter_payment_information GET    /enrollment/payment-info(.:format)  enrollment#enter_payment_information
  enrollment_payment_info POST   /enrollment/payment-info(.:format)  enrollment#create_payment_information
                  deposit GET    /enrollment/deposit(.:format)       enrollment#new_deposit
       enrollment_deposit PUT    /enrollment/deposit(.:format)       enrollment#create_deposit
                          PATCH  /enrollment/deposit(.:format)       enrollment#create_deposit