resolveParameters example

$parameters = $event->getControllerResult();

        if (!\is_array($parameters ?? [])) {
            return;
        }
        $attribute = $event->getRequest()->attributes->get('_template');

        if (!$attribute instanceof Template && !$attribute = $event->controllerArgumentsEvent?->getAttributes()[Template::class][0] ?? null) {
            return;
        }

        $parameters ??= $this->resolveParameters($event->controllerArgumentsEvent, $attribute->vars);
        $status = 200;

        foreach ($parameters as $k => $v) {
            if (!$v instanceof FormInterface) {
                continue;
            }
            if ($v->isSubmitted() && !$v->isValid()) {
                $status = 422;
            }
            $parameters[$k] = $v->createView();
        }

        

 else {
            throw new \LogicException(sprintf('You should either pass a "%s" instance or provide the $parameters argument of the "%s" method.', SymfonyContainerInterface::class, __METHOD__));
        }

        $this->defaultLocale = $defaultLocale;
    }

    public function getRouteCollection(): RouteCollection
    {
        if (!isset($this->collection)) {
            $this->collection = $this->container->get('routing.loader')->load($this->resource, $this->options['resource_type']);
            $this->resolveParameters($this->collection);
            $this->collection->addResource(new ContainerParametersResource($this->collectedParameters));

            try {
                $containerFile = ($this->paramFetcher)('kernel.cache_dir').'/'.($this->paramFetcher)('kernel.container_class').'.php';
                if (file_exists($containerFile)) {
                    $this->collection->addResource(new FileResource($containerFile));
                } else {
                    $this->collection->addResource(new FileExistenceResource($containerFile));
                }
            } catch (ParameterNotFoundException) {
            }
        }