app/controllers/application_controller.rb
require "application_responder"
class ApplicationController < ActionController::Base
self.responder = ApplicationResponder
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
rescue_from Sequel::RecordNotFound do
@error_message = '404'
render template: 'errors/error', status: 404
end
end