public function filterByJob($filterByJob)
    {
        $result = $this->filter(
            function ($key, $value) use ($filterByJob) {
                $jobList = $value->getJobList();

                foreach ($jobList as $job) {
                    if ($filterByJob == $job) {
                        return true;
                    }
                }
            }
        );

        if ($result && 1 === count($result)) {
            $results = $result->toArray();

            return array_shift($results);
        }

        return $result;
    }