The Error

gistfile2.txt

Fatal error: method_exists(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "Proxies\JStoutMainBundleEntityLocationProxy" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /www/jstout/vendor/doctrine/lib/Doctrine/ORM/UnitOfWork.php on line 2266 Call Stack: 0.0001 622816 1. {main}() /www/jstout/web/app_dev.php:0 0.0120 1391096 2. Symfony\Component\HttpKernel\Kernel->handle() /www/jstout/web/app_dev.php:21 0.0155 1643168 3. Symfony\Bundle\FrameworkBundle\HttpKernel->handle() /www/jstout/app/bootstrap.php.cache:612 0.0155 1643888 4. Symfony\Component\HttpKernel\HttpKernel->handle() /www/jstout/vendor/symfony/src/Symfony/Bundle/FrameworkBundle/HttpKernel.php:44 0.0155 1643888 5. Symfony\Component\HttpKernel\HttpKernel->handleRaw() /www/jstout/app/bootstrap.php.cache:416 0.0808 3808568 6. call_user_func_array() /www/jstout/app/bootstrap.php.cache:438 0.0808 3808816 7. JStout\MainBundle\Controller\VendorController->signupAction() /www/jstout/app/bootstrap.php.cache:0 0.1496 5248224 8. JStout\MainBundle\Form\Vendor\SignupHandler->process() /www/jstout/src/JStout/MainBundle/Controller/VendorController.php:55 0.1994 6163232 9. Doctrine\ORM\EntityManager->flush() /www/jstout/src/JStout/MainBundle/Form/Vendor/SignupHandler.php:57 0.1994 6163232 10. Doctrine\ORM\UnitOfWork->commit() /www/jstout/vendor/doctrine/lib/Doctrine/ORM/EntityManager.php:328 0.1994 6163232 11. Doctrine\ORM\UnitOfWork->computeChangeSets() /www/jstout/vendor/doctrine/lib/Doctrine/ORM/UnitOfWork.php:249 0.1998 6187424 12. Doctrine\ORM\UnitOfWork->computeChangeSet() /www/jstout/vendor/doctrine/lib/Doctrine/ORM/UnitOfWork.php:505 0.2000 6196648 13. Doctrine\ORM\UnitOfWork->computeAssociationChanges() /www/jstout/vendor/doctrine/lib/Doctrine/ORM/UnitOfWork.php:490 0.2000 6221624 14. Doctrine\ORM\UnitOfWork::objToStr() /www/jstout/vendor/doctrine/lib/Doctrine/ORM/UnitOfWork.php:572 0.2000 6221752 15. method_exists() /www/jstout/vendor/doctrine/lib/Doctrine/ORM/UnitOfWork.php:2266 

SignupHandler.php

<?php

namespace JStout\MainBundle\Form\Vendor;

use JStout\MainBundle\Component\Form\FormHandlerInterface,
    Symfony\Component\Form\Form,
    Symfony\Component\HttpFoundation\Request,
    Doctrine\ORM\EntityManager,
    JStout\MainBundle\Entity,
    Symfony\Component\Security\Acl\Domain\ObjectIdentity,
    Symfony\Component\Security\Acl\Domain\UserSecurityIdentity,
    Symfony\Component\Security\Acl\Permission\MaskBuilder;

class SignupHandler implements FormHandlerInterface
{
    protected $form;
    protected $request;
    protected $entityManager;

    public function buildFormHandler(Form $form, Request $request, EntityManager $entityManager)
    {
        $this->form = $form;
        $this->request = $request;
        $this->entityManager = $entityManager;
    }

    public function process(array $extras)
    {
        if ('POST' == $this->request->getMethod()) {
            // bind form data
            $this->form->bindRequest($this->request);

            // If form is valid
            if ($this->form->isValid() && ($vendor = $this->form->getData()) instanceOf Entity\Vendor) {
                // If owner is valid, create user
                if ($vendor->getOwner() instanceOf Entity\User) {
                    $encoder = $extras['encoderFactory']->getEncoder($vendor->getOwner());
                    $salt = base_convert(sha1(uniqid(mt_rand(), true)), 16, 36);
                    $vendor->getOwner()->setSalt($salt);
                    $vendor->getOwner()->setPassword($encoder->encodePassword($vendor->getOwner()->getPlainPassword(), $salt));
                    $vendor->getOwner()->setEnabled(1);
                    $vendor->getOwner()->addRole('USER_VENDOR');
                }

                // persist vendor
                $this->entityManager->persist($vendor);

                $this->entityManager->flush();

                // create acl
                $acl = $extras['aclProvider']->createAcl(ObjectIdentity::fromDomainObject($vendor));

                // grant owner access
                $acl->insertObjectAce(UserSecurityIdentity::fromAccount($vendor->getOwner()), MaskBuilder::MASK_OWNER);

                // update acl
                $extras['aclProvider']->updateAcl($acl);
                
                return $vendor;
            }
        }

        return false;
    }
}

SignupType.php

<?php

namespace JStout\MainBundle\Form\Vendor;

use Symfony\Component\Form\AbstractType,
    Symfony\Component\Form\FormBuilder,
    JStout\MainBundle\Form\User\SignupType as UserType,
    JStout\MainBundle\Form\Common\LocationType;

class SignupType extends AbstractType
{
    protected $loggedIn = false;

    public function __constructor($security)
    {
        $this->loggedIn = $security->isGranted('ROLE_USER');
    }

    public function buildForm(FormBuilder $builder, array $options)
    {
        if (false === $this->isLoggedIn()) {
            $builder->add('owner', new UserType());
        }

        $builder
            ->add('name')
            ->add('website')
            ->add('phone')
            ->add('phoneExt')
            ->add('description')
            ->add('locations', new VendorLocationType());
    }

    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'JStout\MainBundle\Entity\Vendor'
        );
    }

    protected function isLoggedIn()
    {
        return $this->loggedIn;
    }
}

VendorController.php

<?php

namespace JStout\MainBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller,
    Sensio\Bundle\FrameworkExtraBundle\Configuration as Extra,
    JStout\MainBundle\Component\Form\FormHandlerInterface,
    JStout\MainBundle\Entity\User,
    JStout\MainBundle\Entity\Vendor,
    JStout\MainBundle\Entity\Location,
    JStout\MainBundle\Form\Vendor\SignupType,
    JStout\MainBundle\Form\Vendor\SignupHandler;


/**
 * @Extra\Route("/vendor")
 */
class VendorController extends Controller
{
    /**
     * @Extra\Route(name="vendor_index")
     * @Extra\Template()
     */
    public function indexAction()
    {
        return array();
    }

    /**
     * @Extra\Route("/sign-up", name="vendor_signup")
     * @Extra\Template()
     */
    public function signupAction()
    {
        // initialize new vendor
        $vendor = new Vendor();

        if (($user = $this->get('request')->getSession()->get('user')) instanceOf User) {
            $vendor->setOwner($user);
        }

        // get vendor signup form
        $form  = $this->get('form.factory')->create(new SignupType(), $vendor);
        
        // get form handler for vendor form
        $formHandler = $this->get('form.handler')->create(new SignupHandler(), $form);

        // extra data for form handler
        $extras = array(
            'encoderFactory' => $this->get('security.encoder_factory'),
            'aclProvider' => $this->get('security.acl.provider')
        );

        // redirect if form submission was valid
        if (($vendor = $formHandler->process($extras)) instanceOf Vendor) {
            return $this->redirect($this->generateUrl('vendor_index'));
        }

        return array(
            'form' => $form->createView()
        );
    }
}