php - MongoDB + ドクトリン + Zend

Question

Zend と Doctrine 2 を統合して MongoDB と連携させています。クイックスタート スケルトンを使用しています。

これがDoctrine.phpです

<?php
use Doctrine\MongoDB\Connection;
use Doctrine\ODM\MongoDB\DocumentManager;
use Doctrine\ODM\MongoDB\Mapping\Annotations;
use Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver;
use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
class Resource_Doctrine extends Zend_Application_Resource_ResourceAbstract
{   
    protected $_options = array();
    private $manager;

    public function __set($config, $null) {
        $this->_options = array(
                'connection' => array(
                        'dbname' => $config['connection']['dbname'],
                        ),
                'modelDir' => $config['modelDir'],
                'proxyDir' => $config['proxyDir'],
                'proxyNamespace' => $config['proxyNamespace'],
                'hydratorDir' => $config['proxyDir'],
                'hydratorNamespace' => $config['proxyNamespace'],
                'autoGenerateProxyClasses' => $config['autoGenerateProxyClasses']
        );
    }

    public function init()
    {   
        $zendConfig = $this->getOptions();
        if(!empty($zendConfig)) Zend_Registry::set('config', $zendConfig); 
        $options = Zend_Registry::get('config');
        $this->__set($options,null);
        $config = new \Doctrine\ODM\MongoDB\Configuration;
        $config->setDefaultDB($options['connection']['dbname']);
        $config->setProxyDir($this->_options['proxyDir']);
        $config->setProxyNamespace($this->_options['proxyNamespace']);
        $config->setHydratorDir($this->_options['hydratorDir']);
        $config->setHydratorNamespace($this->_options['hydratorNamespace']);
        $config->setMetadataDriverImpl(AnnotationDriver::create($this->_options['modelDir']));
        Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver::registerAnnotationClasses();
        $dm = DocumentManager::create(new Connection(), $config);

        return $dm;
    }
}

クラス

<?php

use Doctrine\ODM\MongoDB\Mapping\ClassMetadata;
use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;

/** @ODM\Document */
class Application_Model_Guestbook
{
    /**
     * @ODM\Id
     */
    public $id;

    /** @ODM\String */
    public $email;

    /** @ODM\String */
    public $comment;

    /** @ODM\Date */
    public $created;

    public function setGuestbook($comment)
    {
        $this->email = $comment['email'];
        $this->comment = $comment['comment'];
        $this->created = date('d-m-Y H:i:s');
    }

    public function getGuestbook()
    {
        return $this;
    }
}

そして、アクション

public function signAction()
    {
        $request = $this->getRequest();
        $this->getHelper('loadResource')->form('sign', 'Guestbook');
        $form    = new Application_Form_Guestbook();

        if ($this->getRequest()->isPost()) {
            if ($form->isValid($request->getPost())) {
                $guestbook = new Application_Model_Guestbook;
                $guestbook->setGuestbook($form->getValues());
                try
                {
                    $this->em->persist($guestbook);
                    $this->em->flush($guestbook);
                    return $this->_helper->redirector('index');
                }
                catch (Exception $e)
                {
                    throw new Exception($e);
                }
            }
        }

        $this->view->form = $form;
    }

エラーが表示されます: Catchable fatal error: Argument 3 passed to Doctrine\ODM\MongoDB\Hydrator\HydratorFactory::hydrate() must be of the type array, null given, called in /home/gabiru/www/twitradar_mongo/ library/Doctrine/ODM/MongoDB/UnitOfWork.php 行 2518

私は検索しましたが、同じ問題を抱えている人の結果は見つかりませんでした。誰かそれについて何か考えがありますか?

3番目の引数は変数 $hint で、引数がどこに設定されているかわかりません。