Mybatis使用ResultMap中嵌套collection标签主键id不封装的问题

mapper.xml文件如下

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.fangxinqian.order.zhendao.service.mapper.ProductMapper">

<resultMap type="cn.fangxinqian.order.zhendao.common.vos.ProductByGroupVO" id="productByGroupVO">
<collection column="id" property="simple" ofType="cn.fangxinqian.order.zhendao.common.vos.EnclosureVO"
select="getSimple">
</collection>
<collection column="id" property="active" ofType="cn.fangxinqian.order.zhendao.common.vos.EnclosureVO"
select="getActive">
<id column="id" property="id"/>
<result column="name" property="name"/>
<result column="enclosure_url" property="enclosureUrl"/>
</collection>
</resultMap>

<select id = "getProductByGroup" resultMap="productByGroupVO">
SELECT distinct p.id,
p.product_name,
p.create_time,
IFNULL(
(SELECT count(1)
FROM t_template_product
GROUP BY product_id
HAVING product_id = p.id),0) 'count'
FROM t_product p
LEFT JOIN t_template_product tp
ON p.id = tp.product_id
WHERE true
<if test="groupId != 0">
AND p.group_id = #{groupId}
</if>
<if test="key != null">
AND p.product_name like CONCAT(CONCAT('%',#{key},'%'))
</if>
</select>


<select id="getSimple" resultType="cn.fangxinqian.order.zhendao.common.vos.EnclosureVO" parameterType="integer">
select id,`name`,enclosure_url from t_enclosure e where product_id = #{id} and enclosure_type = 0 and enclosure_status = 0
</select>


<select id="getActive" resultType="cn.fangxinqian.order.zhendao.common.vos.EnclosureVO" parameterType="integer">
select id,`name`,enclosure_url from t_enclosure e where product_id = #{id} and enclosure_type = 1 and enclosure_status = 0
</select>
</mapper>

这是我的xml文件，如果不使用嵌套查询的话，只执行getProductByGroup是能正常返回的，但是加上了嵌套查询以后，返回除了主查询的主键没有封装进去，别的都正常，确定写了get和set方法，后面在某个论坛上面找到一个解答，就是在写resultMap的时候，主键不以id这样的格式来写，而是以标签来写，在resultMap加上这样就能成功返回啦。

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