baoshi-was/app/OrderPackage.php

<?php

namespace App;

use App\Traits\ModelTimeFormat;
use Illuminate\Database\Eloquent\Model;

class OrderPackage extends Model
{
    //
    use ModelTimeFormat;

    protected $fillable = ['order_id','logistic_number'];

    public function order(){
        return $this->belongsTo('App\Order','order_id','id');
    }

    public function commodities(){
        return $this->hasMany('App\OrderPackageCommodities','order_package_id','id');
    }

    public function delete()
    {
        $this->commodities()->delete();
        return parent::delete();
    }

    public function deleteSafe(){
        return parent::delete();
    }

}