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We'll use the index page of the Site controller, checking to make sure that the register and login links are both present, and that there is no link for "Home" (since link_to_unless_current should suppress any links to the current page).
We'll put our navigation link function there: Listing 4.25 app/helpers/application helper. rb module ApplicationHelper # Return a link for use in layout navigation. def nav_link (text, controller, action = "index") return link_to_unless_current text,: controller = > controller,: action = > action end end 15 The application helper is a module, which is a collection of functions designed to be mixed in to a class.