我在rails 3中遇到acts_as_tree_on_steroids的问题。是否有任何插件可以在rails 3中起到与树相同的作用
app/controllers/question_attributes_controller.rb:9:in `index'
渲染 /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/_trace.erb (0.8ms) 渲染 /usr/local/lib/ruby /gems/1.9.1/gems/actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (6.5ms) 渲染/usr/local/lib/ruby/gems/1.9.1/gems/ actionpack-3.0.3/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb 在救援/布局中 a.descendants