/**
  * On the page with classes, the user can select a specific class
  * @Route("/car/{className}", name="viewCar")
  * @return type
  */
 public function selectCarAction($className, Request $request)
 {
     $session = $request->getSession();
     $automobileFactory = $this->get('AutoFactory');
     $automobileFactory::getInstance();
     $car = $session->get("automobileSession");
     //Check whether the automobile is already registered in the session
     if ($car == NULL) {
         $car = $automobileFactory->createVehicle($className);
         $christmasDiscount = $this->get('OrdinaryDiscount');
         $car->addDiscountOption($christmasDiscount);
         $session->set("automobileSession", $car);
     }
     $specs = $this->getSpecificationsDoctrine();
     $availableSpecs = SpecStorage::adjustOptionalSpecifications($car->getDefaultSpecs(), $specs);
     return $this->render('MercedesVStoreBundle:Default:car.html.twig', array("specifications" => $availableSpecs, "activeMenuItem" => "cars"));
 }