<?php
namespace Shop\Model;
use Think\Model\RelationModel;
class ShopCartModel extends RelationModel{
    //关联模型
    Protected $_link=array(
        "cms_product"=>array(
            'mapping_type'  => self::BELONGS_TO,
            'foreign_key' => 'product_id',
        ),
        "cat"=>array(
            'mapping_type'  => self::BELONGS_TO,
            'foreign_key' => 'catid',
        ),        
    );

}