Updating a record with rollback to original attributes

update_user.rb

class UpdateUser
  include Interactor
  
  # Receives: user - A User record to update.
  #           new_attributes - A hash of attributes to be saved to the user.
  # Updates: user
  # Provides: old_attributes - A hash of only those user attributes that
  #             changed and their original values.
  
  def call
    context.user.attributes = context.new_attributes
    context.old_attributes = context.user.changed_attributes
    
    unless context.user.save
      context.fail!(errors: context.user.errors)
    end
  end
  
  def rollback
    context.user.update(context.old_attributes)
  end
end