我正在为应用程序构建一个API，并使用下面的代码生成一些JSON。
Catagory.all.as_json(include: { questions: { include: :answers, only: [:title, :question_type]}}, only: :name)
返回的内容看起来像这样。
[{"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。我找到了一种方法，但感觉不是很枯燥。感觉太重复了。
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')}}}
我发现它的可读性也不太好。
感谢
你走在正确的道路上，我不知道你为什么没有自己解决这个问题。您可以将查询更改为：
Catagory.all.as_json(include: { questions: { include: { answers: { only: [:question_id, :text, :correct]} }, only: [:title, :question_type]}}, only: :name)
如果你经常使用这个查询，那么请把它放在Category类的一个范围内。