class Serve
  include Mongoid::Document
  include Mongoid::Timestamps
  include Redis::Objects

  field :name, type: String
  field :serve_type, type: String

  ## 接收消息的条数
  counter :t_receive
  ## 发送消息的条数
  counter :t_send

  belongs_to :itemable, polymorphic: true
  belongs_to :user
end

我想以计数器进行排序，执行Serve.desc(:t_receive).page(params[:page]).per(10) 但是返回的集合是随机的 不是按t_receive字段排序的。求高见！