ZF2: Assigning variables to the controller using events

gistfile1.php

// @see http://samsonasik.wordpress.com/

public function onBootstrap(MvcEvent $e)
{
    $sharedEvents        = $e->getApplication()->getEventManager()->getSharedManager();
    $sm = $e->getApplication()->getServiceManager();
    
    $sharedEvents->attach('Zend\Mvc\Controller\AbstractActionController','dispatch', 
         function($e) use ($sm) {
            $controller = $e->getTarget();
            $controller->em = $sm->get('em');
        }, 100
   );
}