Mybatis使用ResultMap中嵌套collection標籤主鍵id不封裝的問題

mapper.xml文件如下

<?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>

    <!-- 獲取未刪除的普通附件 -->
    <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>

    <!-- 獲取未刪除的活動附件 -->
    <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>

這是我的xml文件，如果不使用嵌套查詢的話，只執行getProductByGroup是能正常返回的，但是加上了嵌套查詢以後，返回除了主查詢的主鍵沒有封裝進去，別的都正常，確定寫了get和set方法，後面在某個論壇上面找到一個解答，就是在寫resultMap的時候，主鍵不以id這樣的格式來寫<id column="id" property="id"/>，而是以標籤來寫，在resultMap加上<result column="id" property="id"/> 這樣就能成功返回啦。

    <resultMap type="cn.fangxinqian.order.zhendao.common.vos.ProductByGroupVO" id="productByGroupVO">
        <result column="id" property="id"/>
        <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>