我的代碼出了什么問題，我嘗試使用 Laravel 框架導(dǎo)出數(shù)據(jù)表。下載的文件內(nèi)容為空。StockModel.phpnamespace App; use Illuminate\Database\Eloquent\Model; class Stock extends Model {        protected $table = 'stock_tb';         protected $primaryKey = 'id';         protected $fillable = ['stock_id', 'input_date', 'quantity']; }管理控制器.phpuse Excel;use App\Stock;use App\Exports\StockExport;class adminController extends Controller {    public function __construct() {  }    public function printStockReport(){              return Excel::download(new StockExport('07/01/2020'), 'ado.xlsx');    }StockExport.phpnamespace App\Exports;use App\Stock;use Maatwebsite\Excel\Concerns\FromQuery;class StockExport implements FromQuery{    protected $id;     public function __construct($date_var)    {        $this->date = $date_var;    }      public function query()    {      return Stock::query()->where('input_date', $this->date)->get();    }   }路由器Route::get('admin/printStockReport', 'adminController@printStockReport');僅供參考：我在 RDBMS 上運(yùn)行 SQL 代碼，條件輸入日期為07/01/2020。它返回 129 條記錄。謝謝