Question

I am integrating Zend Framework and Doctrine 2.

The question is, in my controllers and view, in need to access the model. I can do all this through a single instance of the EntityManager.

Where do I store this instance ?

• Zend_Registry ? That’s where it is now, it is accessible from everywhere, but not really practical : $em = Zend_Registry::get('EntityManager');
• As a controller and view property ? That would be accessible as $this->em, I like this
• Create a factory class that will return the instance ? $em = My\EntityManager\Factory::getInstance();. Encapsulation is good, but long to type…
• Is the EntityManager a Singleton already ? -> (update) not it is not

Answer 1

I wouldn’t recommend using the EntityManager directly in your Controllers and Views. Instead, use a Service layer and inject the EntityManager it that.

I have two custom action helpers, one to retrieve Repositories and one for Services. Each action hold a reference to the EntityManager and inject it accordingly before handing it back to the Controller.

Not my actual code but something like this (not tested):

My/Controller/Action/Helper/Service.php

<?php

namespace My\Controller\Action\Helper;

use Doctrine\ORM\EntityManager;

class Service extends \Zend_Controller_Action_Helper_Abstract
{

    private $em;

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
    }

    public function direct($serviceClass)
    {
        return new $serviceClass($this->em);
    }

}

You can write a similar Action Helper to retrieve Repositories.

Then, register the helper in your bootstrap (where we also have access to the EntityManager):

<?php

use Zend_Controller_Action_HelperBroker as HelperBroker,
    My\Controller\Action\Helper\Service;

class Bootstrap extends Zend_Application_Bootstrap_Bootstrap
{

    public function _initActionHelpers()
    {
        $this->bootstrap('doctrine');
        $em = $this->getResource('doctrine');

        HelperBroker::addHelper(new Service($em));
    }

}

Now write a simple Service.

My/Domain/Blog/Service/PostService.php

<?php

namespace My\Domain\Blog\Service;

use Doctrine\ORM\EntityManager,
    My\Domain\Blog\Entity\Post;

class PostService implements \My\Domain\Service
{

    private $em;

    public function __construct(EntityManager $em)
    {
        $this->em = $em;
    }

    public function createPost($data)
    {
        $post = new Post();
        $post->setTitle($data['title']);
        $post->setContent($data['content']);

        $this->em->persist($post);
        $this->em->flush(); // flush now so we can get Post ID

        return $post;
    }

}

And to bring it all together in a controller action:

<?php

class Blog_PostController extends Zend_Controller_Action
{

    private $postService;

    public function init()
    {
        $this->postService = $this->_helper->Service('My\Domain\Blog\PostService');
    }

    public function createPostAction()
    {
        // normally we'd get data from the actual request
        $data = array(
            "title" => "StackOverflow is great!",
            "content" => "Imagine where I'd be without SO :)"
        );
        // and then validate it too!!

        $post = $this->postService->createPost($data);
        echo $post->getId(); // Blog post should be persisted
    }

}