如何设置缓存 key 而且不冲突。

class Region extends Model
{
    use ModelTree;
    protected $table = 'region';
    public $timestamps = false;
    public static function provinces()
    {
        return Cache::remember(__METHOD__, config('cache.long'), function () {
            return (new static())->where('pid', 0)->where('type', 0)->get()->toArray();
        });
    }
}