在Mongoid中创建有关对象创建的嵌入式文档

Let's say I have these:

假设我有这些:

class User
  include Mongoid::Document
  field :name, type: String
  field :email, type: String
  embeds_many :auths

  attr_protected :name, :email
end

class Auth
  include Mongoid::Document

  field :provider
  field :uid

  embedded_in :user

  attr_protected :provider, :uid
end
class User