用mongoid刪除嵌入文檔

Question

我正在用mongoid構建我的第一個應用程序，並且在刪除嵌入的資源時遇到問題。我有這些模型：

class Article 
include Mongoid::Document 
field :body 
embeds_many :comments 

等。

class Comment 
include Mongoid::Document 
field :body 
embedded_in :article, :inverse_of => :comments 
end 

我不明白爲什麼我無法從文章

ruby-1.9.2-p290 :043 > @article.comments 
    => [#<Comment _id: 4eb0e991a27d201ded000038, _type: nil, body: "foo", score: nil>] 
    ruby-1.9.2-p290 :045 > @article.comments.first.destroy 
    => true 
    ruby-1.9.2-p290 :046 > @article.comments 
    => [] 
    ruby-1.9.2-p290 :047 > @article.save 
    => true 
    ruby-1.9.2-p290 :049 > @article.reload 
    => #<Article _id: 4eb0e991a27d201ded000037, _type: nil, body: "foo", title: .... 
    ruby-1.9.2-p290 :050 > @article.comments 
    => [#<Comment _id: 4eb0e991a27d201ded000038, _type: nil, body: "foo", score: nil>] 

調用銷燬刪除評論（或刪除）上嵌入式文檔似乎將其刪除在內存中，而不是從數據庫中刪除。任何有識之士將非常感謝！

Answer 1

請張貼您的導軌版本和您的寶石版本。我檢查你的設置有欄杆3.2.3：

Loading development environment (Rails 3.2.3) 
1.9.3-p0 :001 > @article = Article.new(:body => 'articleBodyText') 
=> #<Article _id: 4f9d90c7f15fefb3a0000001, _type: nil, body: "articleBodyText"> 
1.9.3-p0 :002 > @article.save 
=> true 
1.9.3-p0 :003 > @article.comments = [Comment.new(:body => 'commentBodyText')] 
=> [#<Comment _id: 4f9d90edf15fefb3a0000002, _type: nil, body: "commentBodyText">] 
1.9.3-p0 :004 > @article.save 
=> true 
1.9.3-p0 :005 > @article.comments 
=> [#<Comment _id: 4f9d90edf15fefb3a0000002, _type: nil, body: "commentBodyText">] 
1.9.3-p0 :006 > @article.reload 
=> #<Article _id: 4f9d90c7f15fefb3a0000001, _type: nil, body: "articleBodyText"> 
1.9.3-p0 :007 > @article.comments 
=> [#<Comment _id: 4f9d90edf15fefb3a0000002, _type: nil, body: "commentBodyText">] 
1.9.3-p0 :008 > @article.comments.first.destroy 
=> true 
1.9.3-p0 :009 > @article.comments 
=> [] 
1.9.3-p0 :010 > @article.save 
=> true 
1.9.3-p0 :011 > @article.reload 
=> #<Article _id: 4f9d90c7f15fefb3a0000001, _type: nil, body: "articleBodyText"> 
1.9.3-p0 :012 > @article.comments 
=> [] 
1.9.3-p0 :013 > 

Gemfile中的相關部分：

gem "mongoid", "~> 2.4" 
gem "bson_ext", "~> 1.5" 

Gemfile.lock的的相關部分：

rails (3.2.3) 
mongo (1.6.2) 
mongoid (2.4.8) 
bson (1.6.2) 
bson_ext (1.6.2)