join('jobfair_jobs', 'job_id', '=', 'jobfair_jobs.id') ->select(); } public function jobfairs() { return $this->belongsTo(Jobfairout::class, 'jobfair_id'); } public function jobfair_company() { return $this->hasOne(JobfairoutCompany::class, 'id','exid'); } public function jobs() { return $this->belongsTo(JobfairJob::class, 'job_id','id'); } public function companys() { return $this->belongsTo(Company::class, 'company_id','id'); } }