mlomnicki/ddd-ecommerce

module AggregateRoot
  def apply(event)
    unpublished_events << event
    apply_event(event)
  end

  def apply_old_event(event)
    apply_event(event)
  end

  def unpublished_events
    @unpublished_events ||= []
  end

  private

  def apply_event(event)
    send("apply_#{event_type_underscored(event)}", event)
  end

  def event_type_underscored(event)
    event.event_type.gsub!(/(.)([A-Z])/, '\1_\2').downcase
  end
end