ActiveRecord的：我怎样才能克隆嵌套的关联？

本文介绍了ActiveRecord的：我怎样才能克隆嵌套的关联？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我目前克隆单层关联是这样的：

I'm currently cloning a single-level association like this:

class Survey < ActiveRecord::Base def duplicate new_template = self.clone new_template.questions << self.questions.collect { |question| question.clone } new_template.save end end

让克隆调查然后克隆了问题与这项调查有关。精细。这工作得很好。

So that clones the Survey then clones the Questions associated with that survey. Fine. That works quite well.

但我有麻烦的是，每道题的has_many 答案。因此，调查的has_many问题其中的has_many答案。

But what I'm having trouble with is that each question has_many Answers. So Survey has_many Questions which has_many Answers.

我无法弄清楚如何正确克隆的答案。我试过这样的：

I can't figure out how to clone the answers properly. I've tried this:

def duplicate new_template = self.clone self.questions.each do |question| new_question = question.clone new_question.save question.answers.each do |answer| new_answer = answer.clone new_answer.save new_question.answers << answer end new_template.questions << question end new_template.save end

但是，这确实有些奇怪的东西与实际取代了原来的答案，然后创建新的，所以ID的停止正确匹配。

But that does some weird stuff with actually replacing the original answers then creating new ones, so ID's stop matching correctly.

推荐答案

使用 deep_clonable宝石

new_survey = original_survey.clone :include => [:questions => :answers]