Rails多态关系和link_to

Here's my Schema

这是我的模式

class Menu < ActiveRecord::Base
  belongs_to :menuable, :polymorphic => true
end

class Page < ActiveRecord::Base
  has_one :menu, :as => :menuable
end

class Links < ActiveRecord::Base
  has_one :menu, :as => :menuable
end
class Menu < Active