Add 13.4: Defining a Complex Lifecycle Callback

src/EntityListener/ConferenceEntityListener.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\EntityListener;
+
+use App\Entity\Conference;
+use Doctrine\ORM\Event\LifecycleEventArgs;
+use Symfony\Component\String\Slugger\SluggerInterface;
+
+class ConferenceEntityListener
+{
+    private $slugger;
+
+    public function __construct(SluggerInterface $slugger)
+    {
+        $this->slugger = $slugger;
+    }
+
+    public function prePersist(Conference $conference, LifecycleEventArgs $event)
+    {
+        $conference->computeSlug($this->slugger);
+    }
+
+    public function preUpdate(Conference $conference, LifecycleEventArgs $event)
+    {
+        $conference->computeSlug($this->slugger);
+    }
+}