application_controller.rb

class ApplicationController < ActionController::Base
  # see: http://guides.rubyonrails.org/action_controller_overview.html#rescue-from
  rescue_from ApiKey::NotAuthorized, with: :api_key_not_authorized
  rescue_from ActiveRecord::RecordNotFound, with: :record_not_found
  
  private
  
  # see: http://guides.rubyonrails.org/layouts_and_rendering.html#options-for-render
  def record_not_found
    render file: '404.html', status: :not_found  
  end
  
  def api_key_not_allowed
    render file: 'not_authorized.html', status: :unauthorized
  end
end