goodcars_wxapp/application/api/model/Category.php

<?php
namespace app\api\model;

use think\Model;

/**
 * 分类模型
 */
class Category extends Model
{

    // 开启自动写入时间戳字段
    protected $autoWriteTimestamp = 'int';
    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';

    public function catelist()
    {
        return $this->hasMany('Category','pid','id')->where('status','normal')->field('id,name,pid,image')->order('weigh desc,id desc');
    }
    public function getImageAttr($value)
    {
        // $status = [-1=>'删除',0=>'禁用',1=>'正常',2=>'待审核'];
        if (!empty($value)){
            return config('site.siteUrl').$value;
        }else{
            return $value;
        }

    }
}