ship-expert/app/data/model/helpers/PurchaseItemEnclosure.php

<?php

namespace app\data\model\helpers;

use think\db\Query;
/**
 * @method Query|static show()
 */
trait PurchaseItemEnclosure{

    public function getEnclosureAttr($file){
        $files=json_decode($file,true)?:[];
        foreach ($files as &$file){
            if(isset($file['icon'])){
                $file['icon']=sprintf('%s/static/images/ext/pdf.png',request()->domain());
            }
        }
        return $files;
    }
    public function setEnclosureAttr($file){
        return json_encode($file?:[],256);
    }
}