[debug]

src/PersistentData/Model/ModelWithSlug.php

@@ -20,13 +20,18 @@ abstract class ModelWithSlug extends Model
 
     public function getSlug(): string
     {
+        if ($this->slug === null) {
+            $this->slug = $this->generateSlug();
+            var_dump('getSlug called');
+            var_dump($this->slug);
+        }
+
         return $this->slug;
     }
 
-    public function generateSlug(): string
+    private function generateSlug(): string
     {
         $slugSourceGetMethod = 'get' . str_replace('_', '', ucwords(static::$slugSource, '_'));
-        $this->slug = Slugify::create()->slugify($this->$slugSourceGetMethod());
-        return $this->slug;
+        return Slugify::create()->slugify($this->$slugSourceGetMethod());
     }
 }

src/PersistentData/PersistentDataManager.php

@@ -113,6 +113,10 @@ class PersistentDataManager implements IPersistentDataManager
                 }
             }
 
+            var_dump($original);
+            var_dump($modified);
+            var_dump($diff);
+
             if (count($modified) > 0) {
                 if ($model instanceof ModelWithSlug && isset($modified['slug'])) {
                     $modified['slug'] = $this->generateUniqueSlug($model, $modified['slug']);
@@ -125,8 +129,7 @@ class PersistentDataManager implements IPersistentDataManager
             }
         } else {
             if ($model instanceof ModelWithSlug) {
-                $slug = $model->generateSlug();
-                $modified['slug'] = $this->generateUniqueSlug($model, $slug);
+                $modified['slug'] = $this->generateUniqueSlug($model, $modified['slug']);
             }
 
             $modify->fill($modified);