Rails ActiveRecord Model protected against overwrite by another user updating same instance

foo.rb

class Foo < ActiveRecord::Base
  attr_accessor :timestamp_control

  after_initialize { self.timestamp_control ||= Time.zone.now }
  
  before_validation :overwrite_check
  
  def overwrite_check
    errors[:base] << I18n.t('errors.messages.overwritten') if updated_at > timestamp_control
  end
end