firstOrCreate、firstOrNew方法当model重写__construct后会失效

 public function __construct()
     {
         $this->setConnection(\App\Logic\Data\PlatformInitLogic::getPlatformConnect($this-        >getTable()));
     }

    $model  = new \App\Model\MinishopConfigModel;
        $model->setConnection(\App\Logic\Data\PlatformInitLogic::getPlatformConnect($model->getTable()));

用下面的方法使用firstOrCreate、firstOrNew才可以正常使用.