feat: add image_url

app/Models/Promotion.php

@@ -17,4 +17,14 @@ class Promotion extends Model
         'start_at' => 'datetime',
         'end_at' => 'datetime'
     ];
+
+    protected $appends = ['image_url'];
+
+    public function getImageUrlAttribute()
+    {
+        if ($this->image) {
+            return Storage::disk('public')->url($this->image);
+        }
+        return null;
+    }
 }