Standard Controller Actions
Ruby on Rails defines seven standard controller actions can be used to do common things such as display and modify data.
If you want to create routes for all seven actions in your app, you can add a resource route to your routes file. This resource route below maps URLs to the Messages controller’s seven actions (index, show, new, create, edit, update, and destroy):
resources :messages
If you only want to create routes for specific actions, you can use :only to fine tune the resource route. This line maps URLs only to the Message controller’s index and show actions.
resources :messages, only: [:index, :show]
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