我有一个名为GroupService的模型，它与Service有关联。如果GroupService与Service有关联，我希望在删除GroupService时阻止或限制。如果GroupService没有关联，则用户可以删除它。我一直在遵循这些指南，但这些指南不适用：
[1][Laravel - How to prevent delete when there is dependent field](https://stackoverflow.com/questions/60578308/laravel-how-to-prevent-delete-when-there-is-dependent-field)
[2][https://laracasts.com/discuss/channels/laravel/how-to-prevent-the-delete-of-table-row-that-has-its-id-in-another-table](https://laracasts.com/discuss/channels/laravel/how-to-prevent-the-delete-of-table-row-that-has-its-id-in-another-table)
下面是我的代码：
模型组服务：

class GroupService extends Model
{
    use HasFactory;
    
    protected $table = 't_grup_layanan';
    protected $guarded = ['id'];
    // protected $fillable = [
    //     'bisnis_id',
    //     'deskripsi'
    // ];
    protected $with = ['business'];

    public function service(){
        return $this->hasMany(Service::class);
    }

    public function business(){
        return $this->belongsTo(Business::class, 'bisnis_id');
    }
    
    // protected static function boot(){
    //     parent::boot();

    //     static::deleting(function($groupservice) {
    //         $relationMethods = ['service'];

    //         foreach ($relationMethods as $relationMethod) {
    //             if ($groupservice->$relationMethod()->count() > 0) {
    //                 return false;
    //             }
    //         }
    //     });
    // }

}

模型服务：

class Service extends Model
{
    use HasFactory;

    protected $table = 't_layanan';
    protected $guarded = ['id'];
    // protected $fillable = [
    //     'gruplayanan_id',
    //     'nama',
    //     'deskripsi'
    // ];
    protected $with = ['groupservice'];

    public function groupservice(){
        return $this->belongsTo(GroupService::class, 'gruplayanan_id');
    }
}

控制器组服务：

public function destroy(GroupService $groupservice, $id)
    {
    $groupService = GroupService::find(Crypt::decrypt($id));

        if ($groupService->service()->exists())
        {
            abort('Resource cannot be deleted due to existence of related     resources.');
        }

        $groupService->delete();

        return redirect('/dashboard/gruplayanan/')->with('danger', 'Data dihapus !');
        
        }

迁移组服务：

public function up()
    {
        Schema::create('t_grup_layanan', function (Blueprint $table) {
            $table->id();
            $table->foreignId('bisnis_id')->nullable()->index('fk_bisnis_to_group');
            $table->text('deskripsi');
            $table->timestamps();
        });

    }

迁移服务：

public function up()
    {
        Schema::create('t_layanan', function (Blueprint $table) {
            $table->id();
            $table->foreignId('gruplayanan_id')->index('fk_grup_to_layanan');
            $table->text('nama');
            $table->text('deskripsi');
            $table->timestamps();
        });
    }
    
public function up()
    {
        Schema::table('t_layanan', function (Blueprint $table) {
            $table->foreign('gruplayanan_id', 'fk_grup_to_layanan')->references('id')->on('t_grup_layanan')->onUpdate('CASCADE')->onDelete('CASCADE');
        });
    }