belongsTo(OrderIssue::class,'order_issue_id','id'); } public function rejectedBill() { return $this->belongsTo(RejectedBill::class,'logistic_number_return','logistic_number_return'); } public static function isExit($order_issue_id,$logistic_number_return) { return OrderIssueRejectedBill::query()->where('order_issue_id',$order_issue_id)->where('logistic_number_return',$logistic_number_return)->exists(); } }