phpstock/app/report/model/GoodSpec.php

<?php
declare (strict_types = 1);

namespace app\report\model;

use think\Model;

/**
 * @mixin \think\Model
 */
class GoodSpec extends Model
{
//    protected $append=["spec_name",'spec_value_name'];

	public function spec(){
		return $this->belongsTo(Specs::class,"spec_id","id")->bind(["spec_name"]);
	}
	
	public function SpecInfo(){
		return $this->belongsTo(SpecValue::class,'spec_value_id',"id")->bind(['spec_value_name'=>'spec_value']);
	}
}