优化更新

app/Models/System/City.php

@@ -2,11 +2,13 @@
 
 namespace App\Models\System;
 
+use App\Traits\ModelTrait;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class City extends Model
 {
+    use ModelTrait;
     protected $table = 'system_cities';
 
     protected $fillable = [