fixup! handle slugs in persistent data manager

src/PersistentData/Model/ModelWithSlug.php

@@ -20,16 +20,13 @@ abstract class ModelWithSlug extends Model
 
     public function getSlug(): string
     {
-        if ($this->slug === null) {
-            $this->slug = $this->generateSlug();
-        }
-
         return $this->slug;
     }
 
-    private function generateSlug(): string
+    public function generateSlug(): string
     {
         $slugSourceGetMethod = 'get' . str_replace('_', '', ucwords(static::$slugSource, '_'));
-        return Slugify::create()->slugify($this->$slugSourceGetMethod());
+        $this->slug = Slugify::create()->slugify($this->$slugSourceGetMethod());
+        return $this->slug;
     }
 }

src/PersistentData/PersistentDataManager.php

@@ -125,7 +125,8 @@ class PersistentDataManager implements IPersistentDataManager
             }
         } else {
             if ($model instanceof ModelWithSlug) {
-                $modified['slug'] = $this->generateUniqueSlug($model, $modified['slug']);
+                $slug = $model->generateSlug();
+                $modified['slug'] = $this->generateUniqueSlug($model, $slug);
             }
 
             $modify->fill($modified);