Rails HAML engine rendering

What is wrong here?

H开发者_JAVA百科aml::Engine.new('= image_tag("golfer.png")').render

image_tag is always undefined (ActionView::Helpers in not loaded). How can I fix that? Thx!

I think I found the solution.

  class TagHelper
    include Singleton
    include ActionView::Helpers::TagHelper
    include ActionView::Helpers::AssetTagHelper
  end

  puts Haml::Engine.new('= image_tag("golfer.png")').render(TagHelper.instance)