Mybatis Nested Select for Association/Collection doesn't work

Question

I am trying to test out Mybatis\'s user manual with the result map section. Mybatis version : mybatis-3.1.0

Answer 1

Because there is not an author_id column in the result got from getBlog.

Try:

 select
    b.id,
    b.title,
    b.author_id
    from
    blog b
    where b.id = #{id}