Edit file File name : BillableTrait.php Content :<?php /* * This file is part of the Kimai time-tracking app. * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace App\Repository\Query; trait BillableTrait { /** * @var bool|null */ private $billable = null; public function getBillable(): ?bool { return $this->billable; } public function isBillable(): bool { return $this->billable === true; } public function isNotBillable(): bool { return $this->billable === false; } public function isIgnoreBillable(): bool { return $this->billable === null; } public function setBillable(?bool $isBillable): void { $this->billable = $isBillable; } } Save