将对象从分派侦听器传递给控制器

Question

So I have a dispatch event listener in Module.php, that retrives user object from database, and sets layout variable with it. I want to access the very same object in controller. How can I pass it?

public function onBootstrap($e)
    {

        $eventManager       = $e->getApplication()->getEventManager();
        $moduleRouteListener = new ModuleRouteListener();
        $moduleRouteListener->attach($eventManager);
        $app = $e->getParam('application');
        $app->getEventManager()->attach('dispatch', array($this, 'setPortfolioLayout'));

    }

    /**
     * This event will set $user variable in layout when it's active
     *
     * @param MvcEvent $e
     */
    public function setPortfolioLayout(MvcEvent $e)
    {

        $matchedRoute = $e->getRouteMatch();

        if($matchedRoute->getParam('isPortfolio')) {

            $em = $e->getApplication()->getServiceManager()->get('Doctrine\ORM\EntityManager'); /** @var ObjectManager $em */
            $user = $em->getRepository('Application\Entity\User')->findOneBy(['login' => $matchedRoute->getParam('login')]);

            if(! $user) {
                $e->getResponse()->setStatusCode(404); return;
            }

            $viewModel = $e->getViewModel();
            $viewModel->setVariable('user', $user);
            $viewModel->setTemplate('layout/portfolio');

            $matchedRoute->setParam('user', $user);

        }
    }

I've tried setting the RouteMatch parameter - not the best place to do it, and it is not visible in Controller. There's a $e->getController() method in listener. Should I add a special method for setting the user object for every controller that expects it (adding interfaces traits etc)?

Answer 1

You can access the layout parameters you set in the controller pretty easily:

$user = $this->layout()->user;

Also, you mentioned you cannot access RouteMatch parameters in the controller, but you actually can:

$user = $this->getEvent()->getRouteMatch()->getParam('user');

Additionally, if the "user" is a hard-dependency of this particular controller, I see nothing wrong with setting it into the ServiceManager (before dispatch, so you'd need to increase the priority of your dispatch listener in your example) and making it a hard dependency (constructor injection) of the controller. You'd then create a factory for your controller which constructs the controller like:

return new MyController($sm->get('active-user'));

In this case, you'd want to be careful to make sure that you have adequate controls in place to make sure this controller can't be dispatched in situations where there might not be an 'active-user' service (or whatever you call it).