Inject Doctrine Entity Manager to Zf2 Form - zend-framework

Question

I tried to inject doctrine entity manager in zf2 form in the way that is described here
http://zf2cheatsheet.com/#doctrine (Inject the Entity Manager to Form) but it fails with error _construct() must be an instance of Doctrine\ORM\EntityManager, null given...
Anybody solved this problem ?

Answer 1

There are a few ways on how to do this. The dirty but easier way is to just give the form In your Controller Action The Entity Manager trough a param like so:
/**
* #var Doctrine\ORM\EntityManager
*/
protected $em;
public function getEntityManager()
{
if (null === $this->em) {
$this->em = $this->getServiceLocator()->get('doctrine.entitymanager.orm_default');
}
return $this->em;
}
public function setEntityManager(EntityManager $em)
{
$this->em = $em;
}
...
public function yourAction() {
...
$form = new YourForm($this->getEntityManger());
...
}
You then can just call entity Manager methods within your form:
public function __construct($em)
{
...
$repository = $em->getRepository('\Namespace\Entity\Namespace');
...
}
The more complex but nicer way requires you to add the getServiceconfig function within your modules Module.php:
public function getServiceConfig()
{
return array(
'factories' => array(
'YourFormService' => function ($sm) {
$form = new YourForm($sm);
$form->setServiceManager($sm);
return $form;
}
)
);
}
Within your Form you´ll need to implent the ServiceManagerAwareInterface and the setServiceManager setter.
use Zend\Form\Form as BaseForm;
use Zend\ServiceManager\ServiceManager;
use Zend\ServiceManager\ServiceManagerAwareInterface;
class CategoryForm extends BaseForm implements ServiceManagerAwareInterface
{
protected $sm;
public function setServiceManager(ServiceManager $sm)
{
$this->sm = $sm;
}
public function __construct($sm)
{
...
$em = $sm->get('Doctrine\ORM\EntityManager');
...
}
You then have to call your Form within your controller differently. The usual$form = new YourForm(); constructor will not work with the factory we created.
$form = $this->getServiceLocator()->get('YourFormService');
I usually use the dirty way to get the Entitymanager but as soon as I need the Service Locator I create a factory personally I dont think its worth it to create a big overhead with the services.
I hope this helped a bit.