Make method more clear

[MAILPOET-2439]

lib/Cron/Workers/StatsNotifications/Scheduler.php

@@ -65,7 +65,7 @@ class Scheduler {
     if (!in_array($newsletter->getType(), $this->supported_types)) {
       return false;
     }
-    if ($this->isTaskScheduled($newsletter->getId())) {
+    if ($this->hasTaskBeenScheduled($newsletter->getId())) {
       return false;
     }
     return true;
@@ -91,9 +91,9 @@ class Scheduler {
     return !(bool)$settings['enabled'];
   }
 
-  private function isTaskScheduled($newsletter_id) {
+  private function hasTaskBeenScheduled($newsletter_id) {
     $existing = $this->repository->findByNewsletterId($newsletter_id);
-    return count($existing) > 0;
+    return $existing instanceof StatsNotificationEntity;
   }
 
   private function getNextRunDate() {

lib/Cron/Workers/StatsNotifications/StatsNotificationsRepository.php

@@ -15,20 +15,17 @@ class StatsNotificationsRepository extends Repository {
 
   /**
    * @param int $newsletter_id
-   * @return StatsNotificationEntity[]
+   * @return StatsNotificationEntity|null
    */
   public function findByNewsletterId($newsletter_id) {
     return $this->doctrine_repository
       ->createQueryBuilder('stn')
-      ->join('stn.task', 'tasks')
       ->join('stn.newsletter', 'n')
-      ->addSelect('tasks')
-      ->where('tasks.type = :taskType')
-      ->setParameter('taskType', Worker::TASK_TYPE)
       ->andWhere('n.id = :newsletterId')
       ->setParameter('newsletterId', $newsletter_id)
+      ->setMaxResults(1)
       ->getQuery()
-      ->getResult();
+      ->getOneOrNullResult();
   }
 
   /**

tests/unit/Cron/Workers/StatsNotifications/SchedulerTest.php

@@ -232,7 +232,7 @@ class SchedulerTest extends \MailPoetUnitTest {
       ->expects($this->once())
       ->method('findByNewsletterId')
       ->with($newsletter_id)
-      ->willReturn([new ScheduledTaskEntity()]);
+      ->willReturn(new StatsNotificationEntity(new NewsletterEntity(), new ScheduledTaskEntity()));
     $this->entityManager
       ->expects($this->never())
       ->method('persist');