Inject service to EventSubscriber - symfony

Question

I have problem with my code. I have EventSubscriber:
<?php
namespace App\EventSubscriber;
use App\Service\PostService;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;
class NewPostSubscriber implements EventSubscriberInterface
{
/**
* #var PostService $postService
*/
private $postService;
/**
* #param PostService $postService
*/
public function constructor($postService)
{
$this->postService = $postService;
}
public static function getSubscribedEvents()
{
return [
KernelEvents::REQUEST => 'postNotification'
];
}
public function postNotification(RequestEvent $event)
{
$request = $event->getRequest();
if ('app_post_createpost' != $request->get('_route')) {
return;
}
$post = $this->postService->deletePost(3);
}
}
and i inject for him PostService, but when i send request to post endpoint then i receive exception witj code 500 and text
Call to a member function deletePost() on null
In my services.yaml i have
services:
# default configuration for services in *this* file
_defaults:
autowire: true
autoconfigure: true
App\:
resource: '../src/*'
exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,Kernel.php}'
App\Controller\:
resource: '../src/Controller'
tags: ['controller.service_arguments']
app.post_service:
class: App\Service\PostService
arguments: ['#doctrine.orm.entity_manager']
autowire: true
app.new_post_subscriber:
class: App\EventSubscriber\NewPostSubscriber
arguments: ['#app.post_service']
autowire: false
tags:
- { name: kernel.event_subscriber }
I have method deletePost in my PostService. I don't know what is wrong, i have service and deletePost method, service is inject to subscriber but still not working.

Answer 1

In symfony 4 you don't need declare your services in services.yaml. You can do like this
private $postService;
/**
* #param PostService $postService
*/
public function __construct(PostService $postService)
{
$this->postService = $postService;
}
And in your PostService
private $em;
public function __construct(EntityManagerInterface $em)
{
$this->em = $em;
}
Also you have wrong name of your constructor constructor must be __construct