Delete newsletter posts using a repository

[MAILPOET-5845]

mailpoet/lib/Newsletter/NewsletterPostsRepository.php

@@ -12,4 +12,20 @@ class NewsletterPostsRepository extends Repository {
   protected function getEntityClassName() {
     return NewsletterPostEntity::class;
   }
+
+  /** @param int[] $ids */
+  public function deleteByNewsletterIds(array $ids): void {
+    $this->entityManager->createQueryBuilder()
+      ->delete(NewsletterPostEntity::class, 'p')
+      ->where('p.newsletter IN (:ids)')
+      ->setParameter('ids', $ids)
+      ->getQuery()
+      ->execute();
+
+    // delete was done via DQL, make sure the entities are also detached from the entity manager
+    $this->detachAll(function (NewsletterPostEntity $entity) use ($ids) {
+      $newsletter = $entity->getNewsletter();
+      return $newsletter && in_array($newsletter->getId(), $ids, true);
+    });
+  }
 }