Helpers outside your view

application_controller.rb

class ApplicationController
  # Provide access to helper methods from outside controllers and views,
  # such as in Presenter objects. Rails provides ActionController::Base.helpers,
  # but this does not include any of our application helpers.
  def self.all_helpers
    @all_helpers_proxy ||= begin
      # Start with just the rails helpers. This is the same method used
      # by ActionController::Base.helpers
      proxy = ActionView::Base.new.extend(_helpers)

      # url_for depends on _routes method being defined
      proxy.instance_eval do
        def _routes
          Rails.application.routes
        end
      end
     
      # Import all named path methods
      proxy.extend(Rails.application.routes.named_routes.module)

      # Load all our application helpers to extend
      modules_for_helpers([:all]).each do |mod|
        proxy.extend(mod)
      end

      proxy.instance_eval do
        # A hack since this proxy doesn't pick up default_url_options from anywhere
        def url_for(*args)
          if args.last.is_a?(Hash) && !args.last[:only_path]
            args = args.dup
            args << args.pop.merge(host: ActionMailer::Base.default_url_options[:host])
          end
          super(*args)
        end
      end

      proxy
    end
  end
end

Nice, was able to wrap this into a module and get it working! https://github.com/jcasimir/draper/blob/untested/lib/draper/all_helpers.rb

Super big thanks!