ruby-on-rails - Mongoid 中带有 belongs_to 关联的嵌入式文档

Question

我有像下面这样的模型。我想通过客人“列表”查询具有不同状态的用户的事件。如果没有错，客人名单应该嵌入到事件中吗？如果我的模型设计有误，我愿意接受不同的解决方案。

class User
  include Mongoid::Document

end

class Events
  include Mongoid::Document

  embeds_many :guests
end

Class Guests
  include Mongoid::Document

  embed_in :event
  belongs_to :user

  field :status

end

Answer 1

模型结构错误，因为在 Mongo 中，您只将信息保留在嵌入文档中，而这些信息仅在父文档中需要。

如果在客人中你只有状态字段，那么你可以试试这个，例如，两种状态类型存在或不存在

class User
  include Mongoid::Document
  has_and_belongs_to_belongs_to :event, :inverse_of => "present_guests"
  has_and_belongs_to_belongs_to :event, :inverse_of => "not_present_guests"
end

class Event
  include Mongoid::Document
  has_and_belongs_to_many :present_guests, :class_name => "User", :inverse_of => "present_guests"
  has_and_belongs_to_has_many :not_present_guests, :class_name => "User", :inverse_of => "not_present_guests"
end

然后你可以查询类似的状态

Event.first.present_guests