UUID / Doctrine / ObjectSelect

Controller.php

<?php

$hydrator = new DoctrineObject($this->em, true);
$hydrator->addStrategy('parentFoo', new UUIDFromObjectStrategy());

$form = new FooForm($this->em);
$form->setHydrator($hydrator);
$form->bind($group);

FooForm.php

<?php

use Doctrine\ORM\EntityManager;
use Zend\Form\Form;

class FooForm extends Form
{

    /**
     * @var EntityManager
     */
    private $em;

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
        
        // we want to ignore the name passed
        parent::__construct('Foo');

        $this->add(array(
            'name' => 'id',
            'type' => 'Hidden',
        ));

        $this->add(array(
            'name' => 'name',
            'type' => 'Text',
            'options' => array(
                'label' => 'Name',
            ),
        ));

        $this->add(array(
            'type'       => '\DoctrineModule\Form\Element\ObjectSelect',
            'name'       => 'parentFoo',
            'options'    => array(
                'empty_option'   => '--- please select ---',
                'label'          => 'What?',
                'object_manager' => $this->em,
                'target_class'   => 'My\Foo',
            ),
        ));

        $this->add(array(
            'name' => 'submit',
            'type' => 'Submit',
            'attributes' => array(
                'value' => 'Save',
                'id' => 'submitbutton',
            ),
        ));

    }

}

UUIDFromObjectStrategy.php

<?php

use Ramsey\Uuid\Uuid;
use Zend\Stdlib\Hydrator\Strategy\StrategyInterface;

class UUIDFromObjectStrategy implements StrategyInterface
{

    private $getter;

    public function __construct($getter = 'getId')
    {
        $this->getter = $getter;
    }

    /**
     * Converts the given value so that it can be extracted by the hydrator.
     *
     * @param mixed $value The original value.
     * @return mixed Returns the value that should be extracted.
     */
    public function extract($value)
    {
        if(is_object($value) && method_exists($value, $this->getter)) {
            if($value->{$this->getter}() instanceof Uuid) {
                return (string) $value->{$this->getter}();
            }
        }
        return $value;
    }

    /**
     * Converts the given value so that it can be hydrated by the hydrator.
     *
     * @param mixed $value The original value.
     * @return mixed Returns the value that should be hydrated.
     */
    public function hydrate($value)
    {
        return Uuid::fromString($value);
    }
}