Custom Rails Responder for Service Objects

cards_controller.rb

class Dashboard::Payments::CardsController < ::Dashboard::Payments::BaseController

  self.responder = Core::CustomServiceResponder
  respond_to :html

  before_action :customer_required

  def destroy
    service = Payments::Stripe::DeleteCreditCard.new(current_user)
    status_object = service.call(params[:identifier])
    respond_with status_object, location: -> { dashboard_payments_cards_path }
  end

  def create
    service = Payments::Stripe::AddCreditCard.new(current_user)
    status_object = service.call(params[:stripeToken])
    respond_with status_object, location: -> { dashboard_payments_cards_path }
  end

end

custom_service_responder.rb

module Core

  # This responder is used with service objects.
  #
  # status_object = MyService.new.call
  # respond_with status_object, location: -> { payments_cards_path }, another_option: 'Another option'
  #
  # Since 'result' is not an ActiveRecord::Base object, we have to define a
  # location with 'location' parameter.
  #
  class CustomServiceResponder < ActionController::Responder
    include Responders::FlashResponder
    include Responders::HttpCacheResponder

    private

    def display(resource, options = {})
      super(resource.data, options)
    end

    def has_errors?
      !resource.success?
    end

    # set_flash_message! is overriden to use 'result.error' method.
    def set_flash_message!
      if has_errors?
        status = Responders::FlashResponder.flash_keys.last
        set_flash(status, @alert)
      else
        status = Responders::FlashResponder.flash_keys.first
        set_flash(status, @notice)
      end

      return if controller.flash[status].present?

      if has_errors?
        message = resource.error
      else
        translation_options = mount_i18n_options(status)
        # message = Responders::FlashResponder.helper.t options[:default].shift, options
        message = text_or_html_translation(translation_options[:default])
      end

      set_flash(status, message)
    end

    # Example for `translation_keys` parameter:
    #
    # [
    #  :"flash.dashboard.payments.cards.create.notice_html",
    #  :"flash.dashboard.payments.cards.create.notice",
    #  :"flash.actions.create.notice_html",
    #  :"flash.actions.create.notice",
    #  ""
    # ]
    #
    def text_or_html_translation(translation_keys)
      message = 'Translation not found!'
      translation_keys.each do |translation_key|
        begin
          message = Responders::FlashResponder.helper.t(translation_key, raise: true)
          return message
        rescue I18n::MissingTranslationData
          next
        end
      end

      message
    end

  end
end