ruby-on-rails – Singleton不能被转储 – cached_resource gem

用户模型

class User < ActiveResource::Base
  cached_resource

  class teachers < SimpleDelegator
    attr_accessor :teacher_id

    def initialize(attributes = {},_persisted = true)
      @teacher_id = attributes['teacher_id']
      super(User.find(@teacher_id))
    end
  end
end

我试图缓存用户资源.

/用户/：USER_ID

每当我打电话/ users /：user_id endpoint它给我错误单例不能在行超级(User.find(@teacher_id))转储)

请建议是否有任何其他宝石可以帮助我缓存Activeresource呼叫.