namespace Application\Form;

use Zend\Form\Fieldset;
use Zend\InputFilter\InputFilterProviderInterface;
use Zend\ServiceManager\ServiceManager;

class UserFieldset extends Fieldset implements InputFilterProviderInterface
{
    protected $serviceManager;

    public function __construct(ServiceManager $serviceManager)
    {
        $this->serviceManager = $serviceManager;

        parent::__construct('my-fieldset');

        // Add an element
        $this->add(array(
            'type'    => 'Zend\Form\Element\Email',
            'name'    => 'email',
            'options' => array(
                'label' => 'Email'
            ),
            'attributes' => array(
                'required'  => 'required'
            )
        ));
    }

    public function getInputFilterSpecification()
    {
        $entityManager = $this->serviceManager->get('Doctrine\ORM\EntityManager');

        return array(
            'email' => array(
                'validators' => array(
                    array(
                        'name' => 'DoctrineModule\Validator\NoObjectExists',
                        'options' => array(
                            'object_manager' => $entityManager->getRepository('Application\Entity\User'),
                            'fields' => 'email'
                        )
                    )
                )
            )
        );
    }
}