使用mongoid在mongodb消息父內嵌入消息回覆

我認爲將回復嵌入該消息中的特定消息是一種最佳實踐，我試圖使用mongoid來實現它。這裏是我有使用mongoid在mongodb消息父內嵌入消息回覆

class Message 
    include Mongoid::Document 
    include Mongoid::Timestamps 
    include Mongoid::Paranoia 

    field :subject 
    field :body 
    field :sender_deleted, :type => Boolean, :default => false 
    field :recipient_deleted, :type => Boolean, :default => false 
    field :read_at, :type => DateTime 

    referenced_in :sender, :class_name => "User", :inverse_of => :sender, :foreign_key => 'sender_id' 
    referenced_in :recipient, :class_name => "User", :inverse_of => :recipient, :foreign_key => 'recipient_id' 

    embeds_many :replies, :class_name => 'Message' 
    embedded_in :message, :inverse_of => :replies

這裏就是我試圖定義消息和該國關係的一部分：

embeds_many :replies, :class_name => 'Message' 
    embedded_in :message, :inverse_of => :replies

它不是爲我工作，我不知道爲什麼，任何想法我怎麼能做這樣的事情？

來源

2010-10-25 Allen Bargi

這是否是最佳實踐是一個非常有爭議的話題。例如，您必須介意對象大小的限制（目前爲4 MB，但會很快上升）。

至於你的問題：我建議你改變

embeds_many :replies, :class_name => 'Message' 
    embedded_in :message, :inverse_of => :replies

到

embeds_many :replies, :class_name => 'Message' 
    referenced_in :message

，你也將需要手動指定兩個連接（這不應該是一個問題，因爲他們無論如何都可能是不可改變的）。

irb(main):002:0> msg1 = Message.new :subject => 'new question' 
=> #<Message _id: 4cc7699f457601d7e8000001, created_at: nil, body: nil, updated_at: nil, subject: "new question", read_at: nil, sender_deleted: false, message_id: nil, recipient_deleted: false> 
irb(main):003:0> msg2 = Message.new :subject => 'first comment' 
=> #<Message _id: 4cc769b6457601d7e8000002, created_at: nil, body: nil, updated_at: nil, subject: "first comment", read_at: nil, sender_deleted: false, message_id: nil, recipient_deleted: false> 
irb(main):005:0> msg2.message = msg1 
=> #<Message _id: 4cc7699f457601d7e8000001, created_at: nil, body: nil, updated_at: nil, subject: "new question", read_at: nil, sender_deleted: false, message_id: nil, recipient_deleted: false> 
irb(main):007:0> msg1.replies << msg2 
=> [#<Message _id: 4cc769b6457601d7e8000002, created_at: nil, body: nil, updated_at: nil, subject: "first comment", read_at: nil, sender_deleted: false, message_id: BSON::ObjectId('4cc7699f457601d7e8000001'), recipient_deleted: false>] 
irb(main):008:0> msg1.save 
=> true

來源

2010-10-26 23:59:40

使用mongoid在mongodb消息父內嵌入消息回覆

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