我该如何仅抓取20分钟前创建的带有评论的文章? [英] How would I grab only articles with comments that were created 20 minutes ago?

问题描述

使用mongodb和mongoid.一个人怎么抓所有文章.仅20分钟前创建评论的文章?

Using mongodb and mongoid. How would one grab all articles. Only articles with comments created 20 minutes ago?

class Article
  include Mongoid::Document

  has_many :comments
end

class Comment
  include Mongoid::Document

  belongs_to :article
end

推荐答案

您也可以执行此操作，这应该更有效:

you can also do this, which should be more efficient:

articles = Article.where(:"comments.created_at".gt => 20.minutes.ago)

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