drupal10, when do I need to implement __construct in custom controllerBase
You implement __construct() in your custom ControllerBase when you need to bring in any external service or object that isn't provided as a convenience method by ControllerBase itself. Always pair it with the create() static factory method for proper dependency injection in Drupal.
Code Snippet
<?php
namespace Drupal\my_module\Controller;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Logger\LoggerChannelFactoryInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
/**
* Custom controller that demonstrates dependency injection.
*/
class MyCustomController extends ControllerBase implements ContainerInjectionInterface {
/**
* The logger factory service.
*
* @var \Drupal\Core\Logger\LoggerChannelFactoryInterface
*/
protected $loggerFactory;
/**
* Constructs a new MyCustomController object.
*
* @param \Drupal\Core\Logger\LoggerChannelFactoryInterface $logger_factory
* The logger factory service.
*/
public function __construct(LoggerChannelFactoryInterface $logger_factory) {
$this->loggerFactory = $logger_factory;
}
/**
* {@inheritdoc}
*/
public static function create(ContainerInterface $container) {
return new static(
$container->get('logger.factory') // Request the 'logger.factory' service
);
}
/**
* Displays a custom page.
*/
public function myPage() {
$this->loggerFactory->get('my_module')->notice('My custom page was accessed.');
return [
'#markup' => $this->t('Welcome to my custom page with logging!'),
];
}
}
