用Mongoid批量插入多個記錄？

Question

我正在通過this Stackoverflow answer閱讀關於如何在一個查詢中插入Mongoid中的多個文檔。從我讀的答案：

batch = [{:name => "mongodb"}, {:name => "mongoid"}] 
Article.collection.insert(batch) 

我需要一個例子來了解它是如何工作的。假設我們有文章分類：

class Article 
    include Mongoid::Document 
    include Mongoid::Timestamps 

    field :subject, type: String 
    field :body,  type: String 
    field :remote_id, type: String 

    validates_uniqueness_of :remote_id 

    belongs_to :news_paper, :inverse_of => :articles 
end 

而我例如創建的物品數組：

[ {subject: "Mongoid rocks", body: "It really does", remote_id: "1234", news_paper_id: "abc"}, 
{subject: "Ruby rocks", body: "It really does", remote_id: "1234", news_paper_id: "abc"}, 
{subject: "Rails rocks", body: "It really does", remote_id: "5678", news_paper_id: "abc"} ] 

如何創建它們，並在同一時間，確保驗證捕獲，我有2個remote_id的是一樣的嗎？

Answer 1

如果添加了獨特的索引爲remote_id場，MongoDB的會照顧這一領域的獨特性

index({ remote_id: 1 }, { unique: true })

不要忘了運行create_indexes：rake db:mongoid:create_indexes

之後，你是免費使用Article.collection.insert(batch)。