refactor: remove thumbnail relation and image_url from WorldHeritage model

Author: zigzagdev

src/app/Models/Country.php

@@ -2,7 +2,6 @@
 
 namespace App\Models;
 
-use App\Models\WorldHeritage;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 

src/app/Models/Image.php

@@ -3,7 +3,6 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\SoftDeletes;
 
 class Image extends Model
 {

src/app/Models/WorldHeritage.php

@@ -35,7 +35,6 @@ class WorldHeritage extends Model
         'longitude',
         'short_description',
         'unesco_site_url',
-        'thumbnail_image_id',
     ];
 
     protected $hidden = [
@@ -61,10 +60,6 @@ public function images(): HasMany
             ->orderBy('sort_order', 'asc');
     }
 
-    public function thumbnail(): BelongsTo
-    {
-        return $this->belongsTo(Image::class, 'thumbnail_image_id');
-    }
     protected function casts(): array
     {
         return [