[FLOW3-general] Relation to value object and general question regarding value objects

[Kevin Ulrich Moschallski]

Hi list,

i just created a small FLOW3 project. In this project i have an object 
called GeoLocation which has the properties longitude and latitude. I 
wanted this object to be an value object so i added the @valueobject 
notation and wrote the constructor and the getters:

/**
 * A Geo location
 *
 * @scope prototype
 * @valueobject
 */
class GeoLocation {
    /**
	 * @var float
	 */
	protected $longitude;

    /**
	 * @var float
	 */
	protected $latitude;

	/**
	 * Constructs this location
	 *
	 */
	public function __construct($longitude, $latitude) {
		if (!is_float($longitude)) {
			throw new \InvalidArgumentException('A float value for longitude 
must be passed to this constructor.', 1314040680);
		}
		$this->longitude = $longitude;
        if (!is_float($latitude)) {
			throw new \InvalidArgumentException('A float value for latitude must 
be passed to this constructor.', 1314040681);
		}
		$this->latitude = $latitude;
	}

	/**
	 * Returns longitude
	 *
	 * @return float
	 */
	public function getLongitude() {
		return $this->longitude;
	}

    /**
	 * Returns latitude
	 *
	 * @return float
	 */
	public function getLatitude() {
		return $this->latitude;
	}

}

----

In a second object (address) i added a geolocation property:

/**
	 * The geoLocation
	 *
	 * @var \ThreeDigit\PunchMe\Domain\Model\GeoLocation
     * @ManyToOne
	 */
	protected $geoLocation;

When i run typo3.flow3:doctrine:create i get an error about the missing 
id property for the relation.

Now i read on the doctrine documentation, that value objects are only 
supported if they're an instance of DateTime.

So my two questions are:

- Is there a way to get a relation to an value object in FLOW3, i read 
something about serialize the object?
- And more general, is the decission to setup my GeoLocation object as 
value object i good one, or should it be a entity?

I'm looking forward to hear your replies to learn more about value objects.

Regards,
Kevin