ActiveRecord: How can I clone nested associations?

Question

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

class Survey < ActiveRecord::Base
  def duplicate
    new_template = self.clone
    new_templ         


        

Answer 1

Without using gems, you can do the following:

class Survey < ApplicationRecord
  has_and_belongs_to_many :questions

  def copy_from(last_survey)
    last_survery.questions.each do |question|
      new_question = question.dup
      new_question.save

      questions << new_question
    end

    save
  end
  …
end

Then you can call:

new_survey = Survey.create
new_survey.copy_from(past_survey)

That will duplicate all questions from last Survey to new Survey and tie them.