[FLOW3-general] Get identifier of entity object

[Kevin Ulrich Moschallski]

Hi list,

i'm currently experimenting with flow3 and extdirect. I know want to 
select an object by it's identifier. Therefore i added this to my model:

/**
	 * @var \F3\FLOW3\Persistence\PersistenceManagerInterface
	 * @inject
	 */
	protected $persistenceManager;

/**
	 * The portal's identity
	 * @var string
	 * @identity
	 * @transient
	 */
	protected $identifier;

/**
	 *
	 * @return string
	 */
	public function getIdentifier() {
		return $this->persistenceManager->getIdentifierByObject($this);
	}

This works fine, and getIdentifiertByObject is @api, too. The only 
thing i want to know, is if this is the best way to get the identifiert 
of an object.

Thanks for help in advance.

Regards,
Kevin