ship-expert/app/data/model/ShopProductionOffer.php

<?php

namespace app\data\model;

use app\data\model\helpers\PurchaseOrderId;
use think\admin\Model;

class ShopProductionOffer extends Model
{
    use PurchaseOrderId;
    protected $type=[
        'images'=>'array',
    ];
    public static function onBeforeWrite(self $model)
    {
        if(empty($model['amount'])||$model['amount']==0){
            $model['amount']=null;
        }
    }
    public static function onAfterDelete(self $model): void
    {
        $model->amounts()->delete();
    }

    public function amounts(){
        return $this->hasMany(ShopProductionOfferAmount::class,'offer_id');
    }

    public function user(){
        return $this->belongsTo(DataUser::class,'user_id');
    }
    public function production(){
        return $this->belongsTo(ShopProduction::class,'production_id');
    }
}