Create Doctrine based Form via Factory with Collections and Select Elements Hydratable

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<?php

namespace Zebreco\Form;

use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
use Zebreco\Entity\Ticket;
use DoctrineORMModule\Stdlib\Hydrator\DoctrineEntity as ClassMethods;

class TicketCreateFactory implements FactoryInterface
{

    public function createService(ServiceLocatorInterface $serviceLocator)
    {
        $form = new TicketCreate();
        
        $departments = $serviceLocator->get('Zebreco\Service\Department')->getDepartments();
        $form->get('ticket')->get('department')->setAttribute('options', $departments);
        
        //hydrators
        $em = $serviceLocator->get('doctrine.entitymanager.orm_default');
        $form->setHydrator(new ClassMethods($em));
        $form->get('ticket')->setHydrator(new ClassMethods($em));
        $form->get('ticket')->get('contact')->setHydrator(new ClassMethods($em));

        $postFieldset = new \Zebreco\Form\Fieldset\TicketPostFieldset();
        $postFieldset->setHydrator(new ClassMethods($em));
        $form->get('ticket')->add(array(
            'type' => 'Zend\Form\Element\Collection',
            'name' => 'posts',
            'options' => array(
                'target_element' => $postFieldset
            )
        ));
        
        $form->bind(new Ticket());

        return $form;
    }

}