Rails Routing from the Outside In — Ruby on Rails Guides

Rails Routing from the Outside InThis guide covers the user-facing features of Rails routing.After reading this guide, you will know: How to interpret the code in config/routes.rb. How to construct your own routes, using either the preferred resourceful style or the match method. How to declare route parameters, which are passed onto controller actions. How to automatically create paths and URLs using route helpers. Advanced techniques such as creating constraints and mounting Rack endpoints.

Source: Rails Routing from the Outside In — Ruby on Rails Guides