我有型号如下 class Customer
include Mongoid::Document
field :first_name, type: String
field :last_name, type: String
embeds_one :billing_address, as: :addressable
embeds_one :shippi
您好在查询hash/BSON文档字段我有一个Mongoid型号,规格,与mongoid历史瑰宝加入到这样的: class Spec
include Mongoid::Document
include Mongoid::Timestamps
include Mongoid::History::Trackable
field :due_at, type: Dat