mongoid继承问题

Question

我有这样的模特

class Canvas
  include Mongoid::Document
  field :name
  referenced_in :hero
end

class Browser < Canvas
  field :version, :type => Integer
end

class Hero
  include Mongoid::Document
  field :name
  references_many :canvases
end

如何构建从Hero对象引用的Brower对象.

我想做的就是

h = Hero.create!({:name => 'Aston'})
h.browsers.build

但它给了我一个错误

undefined method `browsers' for #<Hero _id: 4d92c8fc1426960fff000005, name: "Aston">

我错过了什么吗？

谢谢

Answer 1

尝试这个

h.canvases.build({},Browser) 

这适用于 mongoid.2.0.0.rc7