How to boostrap Doctrine2 ODM (similar with ORM) in Zend Framework

doctrine.ini

pluginPaths.applicationResources = APPLICATION_PATH "/resources"

resources.doctrine.documentsDir = APPLICATION_PATH "/../library/My/Documents"
resources.doctrine.config.proxyDir = APPLICATION_PATH "/../library/My/Proxies"
resources.doctrine.config.proxyNamespace = "Proxies"

My_Application_Resource_DoctrineODM.php

<?php

// Assumes you've installed via PEAR doctrine-common & doctrine orm/odm

use Doctrine\Common\ClassLoader,
    Doctrine\Common\Annotations\AnnotationReader,
    Doctrine\ODM\MongoDB\DocumentManager,
    Doctrine\ODM\MongoDB\Mongo,
    Doctrine\ODM\MongoDB\Configuration,
    Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver;

class Zend_Resource_Doctrine extends Zend_Application_Resource_ResourceAbstract
{
    
    public function init()
    {
        $options = $this->getOptions();
        
        $this->registerAutoloaders($options);
        
        // Configuration
        $config = new Configuration();
        foreach ($options['config'] as $option => $value) {
            $method = "set" . ucfirst($option);
            $config->{$method}($value);
        }
        
        // Document reader
        $reader = new AnnotationReader();
        $reader->setDefaultAnnotationNamespace('Doctrine\ODM\MongoDB\Mapping\\');
        $config->setMetadataDriverImpl(new AnnotationDriver($reader, $options['documentsDir']));
        
        $dm = DocumentManager::create(new Mongo(), $config);
        
        Zend_Registry::set('dm', $dm);
    }
    
    public function registerAutoloaders($options)
    {
        $autoloader = \Zend_Loader_Autoloader::getInstance();
        require_once 'Doctrine/Common/ClassLoader.php';
        
        // Doctrine classes
        $classLoader = new ClassLoader('Doctrine');
        $autoloader->pushAutoloader(array($classLoader, 'loadClass'), 'Doctrine');
        
        // Document classes
        $classLoader = new ClassLoader('Documents', $options['documentsDir'] . '/../');
        $autoloader->pushAutoloader(array($classLoader, 'loadClass'), 'Documents');
        
    }
    
}