crm/app/model/Spellgroup.php

<?php

namespace app\model;

use think\Model;

class Spellgroup extends Model
{

    /**
     * 图片拼接
     */
    public function getCoverAttr($value)
    {
        if (empty($value)) return $value;
        $ali_oss_bindurl = config('app.ali_oss_bindurl');
        $url = 'https://' . $ali_oss_bindurl . '/' . $value;
        return $url;
    }

}