干活动记录查询循环

Question

我正在为应用程序构建一个API，并使用下面的代码来生成一些JSON。

Catagory.all.as_json(include: { questions: { include: :answers, only: [:title, :question_type]}}, only: :name) 

返回的东西看起来像这样。

[{"name"=>"music", "questions"=>[{"title"=>"somethings", "question_type"=>"text", "answers"=>[{"id"=>1, "question_id"=>1, "text"=>"something", "correct"=>true, "created_at"=>Mon, 22 Sep 2014 22:19:15 UTC +00:00, "updated_at"=>Mon, 22 Sep 2014 22:19:15 UTC +00:00}, {"id"=>2, "question_id"=>1, "text"=>"something", "correct"=>true, "created_at"=>Tue, 23 Sep 2014 16:01:40 UTC +00:00, "updated_at"=>Tue, 23 Sep 2014 16:01:40 UTC +00:00}]}]}] 

这很好，但我想删除“created_at”，“updated_at”和ID's。我找到了一种方法，但它并不觉得非常干燥。感觉太重复。

Catagory.all.as_json(include: { questions: { include: :answers, only: [:title, :question_type]}}, only: :name).each {|a| a['questions'].each {|w| w['answers'].each {|f| f.delete('created_at')}}}.each {|c| c['questions'].each {|y| y['answers'].each {|b| b.delete('updated_at')}}}.each {|l| l['questions'].each {|x| x['answers'].each {|z| z.delete('id')}}}.each {|g| g['questions'].each {|h| h['answers'].each {|r| r.delete('question_id')}}} 

我觉得它的可读性也不是很好。

感谢

Answer 1

你是在正确的道路上，我不知道你为什么不知道这出自己。您可以将您的查询改成这样：

Catagory.all.as_json(include: { questions: { include: { answers: { only: [:question_id, :text, :correct]} }, only: [:title, :question_type]}}, only: :name) 

如果你正在使用此查询频繁，那么请把它放在一个范围内的内部Category类。