How do I get a service from the container directly, if I didn't/couldn't inject the service using DI?

Question

I have a part of code where I\'m injecting two services $checker and $paginator by dependency injection. It works perfectly:

public         


        

Answer 1

You need to add your dependencies so the service locator can find them.

Add a method getSubscribedServices() to your controller class:

public static function getSubscribedServices()
{
    return array_merge(
        parent::getSubscribedServices(),
        [
            'checker' => Checker::class,
        ]
    );
}

If your controller class extends AbstractController you can simply do:

$this->get('checker');

If you want to do it in another type of class (e.g. a service that doesn't extend AbstractController), then you need to declare that your service implements the ServiceSubscriberInterface.

use Symfony\Contracts\Service\ServiceSubscriberInterface;
use Psr\Container\ContainerInterface;

class FooService implements ServiceSubscriberInterface {

    public function __construct(ContainerInterface $locator)
    {
        $this->locator = $locator;
    }

    public static function getSubscribedServices() { /* same as before */ }

    public function get($service)
    {
        return $this->locator->get($service);
    }
}

... and you would be able to do the same than you in the controller earlier.