Updated City Model and Resource.

app/Http/Resources/API/v2/CityResource.php

@@ -19,6 +19,7 @@ class CityResource extends JsonResource
             'id' => $this->id,
             'uuid' => $this->uuid,
             'name' => $this->name,
+            'url' => $this->url,
         ];
     }
 }

app/Models/City.php

@@ -8,4 +8,10 @@ use Illuminate\Database\Eloquent\Model;
 class City extends Model
 {
     use HasFactory;
+
+    protected $fillable = [
+        'uuid',
+        'name',
+        'url',
+    ];
 }