Symfony2传递给构造函数学说的实体管理器引发错误

Question

On each of my controllers, i need to run security enforcing function from constructor. Problem is that i cannot run doctrine entity manager in constructor to load user id from session, and call findby function from on my user entity. Only way i found is to call this security enforcing function on each of my actions, which is not optimal - code not clean, and alot of function calls. I have searched and test many of user solutions from stackoverflow - many of them is copy paste of others not working code. My services.yml file:

services:
    app.default_controller:
        class: AppBundle\Controller\DefaultController
        arguments:
            - @doctrine.orm.entity_manager

My DefaultController class (its sample controller):

<?php

namespace AppBundle\Controller;
use Doctrine\ORM\EntityManager;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class DefaultController extends Controller
{
    protected $em;
    /**
     * @Route("/", name="homepage")
     */
    public function indexAction(Request $request)
    {
        // replace this example code with whatever you need
        return $this->render('default/index.html.twig', array(
            'base_dir' => realpath($this->getParameter('kernel.root_dir').'/..'),
        ));
    }

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

      $personRepository = $this->getDoctrine()->getManager()->getRepository('AppBundle\Entity\Person');
        //$em = $this->getDoctrine()->getManager();

    }
}

I always having doctrine errors whatever i not do with constructor. Often error example, when im trying to access website

PS. I'm using Symfony 2.8.2, this code examples are not from actual app

Answer 1

please allow me to suggest a different approach. You're better using symfony event system :)

You can set up listeners to be executed before and after any action of your controller.

Just tag the events you want to subscribe to and dispatch them oa service you create for security purposes.

Checkout symfony documentation regarding this How to Set Up Before and After Filters

Good luck! :)