baoshi-was/app/WaybillPayoff.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class WaybillPayoff extends Model
{

    protected $fillable=[
        'waybill_id','total_expense','total_receivable','gross_margin','gross_profit_rate'
    ];

    public function waybill(){
        return $this->belongsTo('App\Waybill','waybill_id','id');
    }
}