point_mall_card/application/common/model/Coupon.php

<?php
namespace app\common\model;
use think\Model;

class Coupon extends Model{

	public function codes(){
		return $this->hasMany('app\common\model\coupon\Code');
	}

	public function type(){
		return $this->belongsTo('app\common\model\coupon\Type');
	}

	public function supplier(){
		return $this->belongsTo('app\common\model\Supplier');
	}

	public function getTotalNumAttr($value,$data){
		return count($this['codes']);
	}

	public function getSoldNumAttr($value,$data){
		$CouponCode = model('coupon.Code');
		return $CouponCode->where(['state'=>1,'coupon_id'=>$data['id']])->count();
	}

	public function getUnsoldNumAttr($value,$data){
		$total_num = $this['total_num'];
		$sold_num = $this['sold_num'];
		return $total_num - $sold_num;
	}


}