I'm trying to get a custom notification logged when a FLAG is triggered. The flag must be interacted with as an event. So I'm using Drupal's Event Subscriber System to log a notification on flagging. Here's my code below...
<?php
namespace Drupal\custom_notifications\EventSubscriber;
use Drupal\flag\FlagServiceInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Drupal\flag\Event\FlagEvents;
use Drupal\flag\Event\FlaggingEvent;
/**
* Flag event subscriber.
*/
class FlagSubscriber implements EventSubscriberInterface {
/**
* The flag service.
*
* @var \Drupal\flag\FlagServiceInterface
*/
protected $flag;
/**
* Constructs a FlagSubscriber object.
*
* @param \Drupal\flag\FlagServiceInterface $flag
* The flag service.
*/
public function __construct(FlagServiceInterface $flag) {
$this->flag = $flag;
}
public function onFlag(FlaggingEvent $event) {
$flagging = $event->getFlagging();
$flagLike = $this->flag->getFlagById('like');
$flaggingUser = $event->getFlagging()->getOwner();
// If flag is LIKE report
if ($flagging->getFlagId() === $flagLike->id()) {
$entity = $flagging->getFlaggable();
$entityAuthor = $entity->getOwner();
$message = [
'id' => $entity->id(),
'bundle' => 'report',
'content' => 'test - user liked your report',
'content_link' => $entity->toUrl()->toString(),
];
$notificationService = \Drupal::service('notifications_widget.logger');
$notificationService->logNotification($message, 'update', $entity, $entityAuthor->id());
ddl($notificationService);
}
}
public static function getSubscribedEvents() {
$events = [];
$events[FlagEvents::ENTITY_FLAGGED][] = ['onFlag'];
return $events;
}
}Flag triggers correctly... unfortunately, the $notificationService variable (\Drupal::service('notifications_widget.logger')) returns as NULL.
Is there a different way it needs to be called to work within the Event Subscriber system?
Closed: works as designed
2.0
Code
Seems as though it was working as it should. If problem comes up again I will followup.
Also, the above should be useful example code for anyone looking to leverage Flags.