Create a doctrine version for isSubscriberProcessed

[MAILPOET-3267]

lib/Newsletter/Sending/ScheduledTaskSubscribersRepository.php

@@ -1,9 +1,11 @@
-<?php
+<?php declare(strict_types = 1);
 
 namespace MailPoet\Newsletter\Sending;
 
 use MailPoet\Doctrine\Repository;
+use MailPoet\Entities\ScheduledTaskEntity;
 use MailPoet\Entities\ScheduledTaskSubscriberEntity;
+use MailPoet\Entities\SubscriberEntity;
 
 /**
  * @extends Repository<ScheduledTaskSubscriberEntity>
@@ -12,4 +14,18 @@ class ScheduledTaskSubscribersRepository extends Repository {
   protected function getEntityClassName() {
     return ScheduledTaskSubscriberEntity::class;
   }
+
+  public function isSubscriberProcessed(ScheduledTaskEntity $task, SubscriberEntity $subscriber): bool {
+    $scheduledTaskSubscriber = $this
+      ->doctrineRepository
+      ->createQueryBuilder('sts')
+      ->andWhere('sts.processed = 1')
+      ->andWhere('sts.task = :task')
+      ->andWhere('sts.subscriber = :subscriber')
+      ->setParameter('subscriber', $subscriber)
+      ->setParameter('task', $task)
+      ->getQuery()
+      ->getOneOrNullResult();
+    return !empty($scheduledTaskSubscriber);
+  }
 }