before_action you can return an HTTP response before the actual controller action is invoked, in the example below, the create action. This allows you to clean up your controller code, so instead of having the create action running the code defined in
verify_request you can have a before action handle it for you.
head method used below is an alias for responding only with the status given (as a symbol), headers, and an empty body.
class ExampleController < ApplicationController before_action :verify_request, :setup_request def create # handle action if before_action's have not rendered head end private def setup_request head :ok unless application_exists end def verify_request head :unauthorized unless auth_token.present? end end