ruby - validates_uniqueness_of 通过两个字段

Question

我有模型:

class Action
  include Mongoid::Document
  field :name, type: String
  field :assignment_date, type: Date
  ...

  index(
    [
      [ :name, Mongo::ASCENDING ],
      [ :assignment_date, Mongo::ASCENDING ]
      ], 
      unique: true
  )

  validates_uniqueness_of [ :name, :assignment_date ]

但是当我尝试插入两个具有相同名称但不同assigned_date 的不同文档时，我收到错误消息:

Mongoid::Errors::Validations - Validation failed - Name is already taken, Assignment date is already taken.:

两个版本我都试过了:

  validates_uniqueness_of [ :name, :assignment_date ]

和

  validates_uniqueness_of :name, :assignment_date 

如果我评论这一行，一切正常。

Answer 1

Mongoid:

validates_uniqueness_of :name, :scope => :assignment_date

来自文档:请注意，对于嵌入式文档，这只会检查该字段在父文档的上下文中是否唯一，而不是在整个数据库中。

http://mongoid.org/docs/validation.html