I would like to do a deep copy on objects including all the attributes.
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.
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.
What is the best way to do deep copy for these cases.
case 1:
@experiment_new = Experiment.create(@experiment_old.attributes.merge(:trials => experiment_old.trails))
case 2:
@experiment_new = Marshal.load(Marshal.dump(@experiment_old.trials))
case 3:
@experiment_new = @experiment_old.clone
Here is the model:
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
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