renderable.rb

module Renderable
  def renderer
    return @renderer if @renderer
    @renderer = ActionView::Base.new(Rails.configuration.paths["app/views"])
    @renderer.class_eval do
      include Rails.application.routes.url_helpers
      include ApplicationHelper
      define_method :default_url_options, -> { Rails.application.config.action_mailer.default_url_options }

      def protect_against_forgery?
        false
      end
    end
    @renderer
  end
end

render anything anywhere