baoshi-was/app/MaterialBoxModel.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

use App\Traits\ModelLogChanging;
use Illuminate\Database\Eloquent\Relations\HasOne;

class MaterialBoxModel extends Model
{
    use ModelLogChanging;

    protected $fillable=[
        "code","description","maximum_kind"
    ];

    public function commodity():HasOne
    {
        return $this->hasOne(CommodityMaterialBoxModel::class);
    }
}