Question

is there any way to preprocess controller data somehow. I’m going to take param from session, validate it and assign it as controller property and use it as $this->myVar inside actions of some controller or all of them if possible. Using controller’s constructor gives me nothing, I couldn’t access request and session data. Thanks!

UPD:
Thanks, jkucharovic, very good solution.
Also there is a bit dirtier solution, without injecting: setContainer() method, which has been called straight after $controller = new Controller();

use Symfony\Component\DependencyInjection\ContainerAwareInterface,
    Symfony\Component\DependencyInjection\ContainerInterface;

class AppServiceController extends Controller {
 private $my_property;

 /**
  * Used as constructor
  */
 public function setContainer(ContainerInterface $container = null)
 {
    parent::setContainer($container);   
    $this->my_property = 'foo';
    // your controller code
 }
}

Answer 1

If you want to use services in __construct method, you have to inject that services first. Then you can use them before any other methods. For example:

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Session;

public function __construct(Request $request, Session $session)
{
    …
}