ruby-on-rails – 使用Rails查看助手与Haml :: Engine

我有一个Rails应用程序,我在其中呈现存储在模型属性中的一块Haml内容.在Haml的那个块中使用Rails视图助手会很不错.目前我在视图助手中使用Haml :: Engine#render来呈现此模型属性的内容.它工作得很好,但我不能使用像= link_to这样的东西.为了说明问题：

irb(main):003:0> haml_text=<<"EOH"
irb(main):004:0" %p
irb(main):005:0"   =image_tag 'someimage'
irb(main):006:0" EOH
=> "%pn  =image_tag 'someimage'n"
irb(main):007:0> engine = Haml::Engine.new(haml_text)
=> #<Haml::Engine:0x7fa9ff7f1150 ... >
irb(main):008:0> engine.render
NoMethodError: undefined method `image_tag' for #<Object:0x7fa9ff7e9a40>
        from (haml):2:in `render'
        from /usr/lib/ruby/gems/1.8/gems/haml-3.0.25/lib/haml/engine.rb:178:in `render'
        from /usr/lib/ruby/gems/1.8/gems/haml-3.0.25/lib/haml/engine.rb:178:in `instance_eval'
        from /usr/lib/ruby/gems/1.8/gems/haml-3.0.25/lib/haml/engine.rb:178:in `render'
        from (irb):8

有关如何做到这一点的任何想法？

好主意？

base = Class.new do
  include ActionView::Helpers::AssetTagHelper
  include ApplicationHelper
end.new

Haml::Engine.new(src).render(base)