How to use multiple routes and multiple param converter with Symfony - symfony

Question

Is it possible to use ParamConverter with different classes depending on the route being called ?
Let's say I have a parent class Food with two children Fruit class and Vegetable class.
I would like to be able to do something like this:
/**
*
* #Route("fruit/{id}", name="fruit_show")
* #ParamConverter("food", class="AppBundle:Fruit")
* #Route("vegetable/{id}", name="vegetable_show")
* #ParamConverter("food", class="AppBundle:Vegetable")
*/
public function showAction(Food $food)
{ ... }

Answer 1

It seems like it is not possible to do exactly what you want. But it may be possible to get what you need with two simple wrapper actions. You won't even need an explicit #ParamConverter annotation. E.g.
/**
*
* #Route("fruit/{id}", name="fruit_show")
*/
public function showFruitAction(Fruit $fruit)
{
return $this->showAction($fruit)
}
/**
*
* #Route("vegetable/{id}", name="vegetable_show")
*/
public function showVegetableAction(Food $food)
{
return $this->showAction($vegetable)
}
public function showAction (Food $food)
{ ... }

Answer 2

The issue I found here is that the ParamConverter uses the last item in the annotations. If it matches the fruit_show route, the $food variable is an instance of the AppBundle:Vegetable class. That's the same if it matches the vegetable_show route.
class FoodController
{
/**
* #Route("/items/fruits/{id}", methods={"GET"}, name="fruits_show")
* #ParamConverter("food", class="AppBundle:Fruit")
* #Route("/items/vegetables/{id}", methods={"GET"}, name="vegetables_show")
* #ParamConverter("food", class="AppBundle:Vegetable")
*/
public function foodAction(Request $request, $food)
{
//
}
}
One workaround you can use is writing your own ParamConverter:
use Doctrine\ORM\EntityManagerInterface;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
use Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterInterface;
use Symfony\Component\HttpFoundation\Request;
class FoodConverter implements ParamConverterInterface
{
protected $entityManager;
public function __construct(EntityManagerInterface $entityManager)
{
$this->entityManager = $entityManager;
}
public function apply(Request $request, ParamConverter $configuration)
{
$id = $request->get('id');
$route = $request->get('_route');
$class = $configuration->getOptions()[$route];
$request->attributes->set($configuration->getName(), $this->entityManager->getRepository($class)->findOneById($id));
return true;
}
public function supports(ParamConverter $configuration)
{
return $configuration->getName() === 'food';
}
}
Adding it to your services:
services:
food_converter:
class: App\SupportClasses\FoodConverter
arguments: ['#doctrine.orm.entity_manager']
tags:
- {name: request.param_converter, priority: -2, converter: food_converter}
Using it like this:
class FoodController
{
/**
* #Route("/items/fruits/{id}", methods={"GET"}, name="fruits_show")
* #Route("/items/vegetables/{id}", methods={"GET"}, name="vegetables_show")
* #ParamConverter("food", converter = "food_converter" class="App:Food", options={"fruits_show" = "App:Fruit", "vegetables_show" = "App:Vegetable"})
*/
public function foodAction(Request $request, $food)
{
var_dump($food);
exit();
}
}