cxinv/app/admin/model/GoodChange.php

<?php
declare (strict_types = 1);

namespace app\admin\model;

use think\Model;

/**
 * @mixin \think\Model
 */
class GoodChange extends Model
{
    public static $mapField = [
        'inv_good_name'=> '商品名称',
        'inv_cat_name' => '商品类目',
        'inv_tax' => '商品税率',
        'is_discount' => '是否有优惠政策',
        'addTax' => '增值税管理内容',
        'inv_tag' => '税率标识'
    ];

    public function Good(){
    	return $this->belongsTo(Good::class,"spuCode","spuCode");
    }
}