MyBatis in foreach查询

<select id="queryByRoleIds" resultMap="menuResult" >
select DISTINCT a.* from sys_menu a INNER JOIN sys_role_menu b
on a.id = b.menu_id
<where>
b.role_id in
<foreach item="item" collection="list" open="(" separator="," close=")" >
#{item}
</foreach>
</where>
</select>