Ruby on Rails对象及其属性的深层复制/深层克隆 [英] Ruby on Rails deep copy/ deep clone of object and its attributes

问题描述

我想对包含所有属性的对象进行深层复制。

I would like to do a deep copy on objects including all the attributes.

experiment_old进行了10次试验。我想通过10个试验将所有内容复制到experiment_new。 Experiment_old还应保留10个试用信息。

The experiment_old is has 10 trials. And I want to copy everything to experiment_new with the 10 trials. experiment_old should also keep the 10 trial info.

但是，我在下面尝试的所有情况下，它们都能很好地复制所有内容，但是experiment_old没有10条试验信息。它们只是出现在experiment_new上。

However, all the cases I tried below, they copy everything well, but experiment_old does not have the 10 trials info. They just show up on experiment_new.

在这些情况下进行深度复制的最佳方法是什么。

What is the best way to do deep copy for these cases.

情况1：

@experiment_new = Experiment.create(@experiment_old.attributes.merge(:trials => experiment_old.trails))

情况2：

@experiment_new = Marshal.load(Marshal.dump(@experiment_old.trials))

情况3：

@experiment_new = @experiment_old.clone

这里是模型：

class Experiment < ActiveRecord::Base
  belongs_to :experimenter
  has_many :trials
  has_many :participants
end


class Trial < ActiveRecord::Base
  belongs_to :experiment
  belongs_to :datum
  belongs_to :condition
  has_one :result_trial
end

推荐答案

您应该克隆每个试验并将它们分配给克隆的试验：

You should clone every trial and assign them to the cloned experiment:

@experiment_new = @experiment_old.clone
@experiment_old.trials.each do |trial|
  @experiment_new.trials << trial.clone
end

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