many to many relation select do not work on GAE too.

I try the dal example code on GAE as below:
    tmp=db.define_table('author',SQLField
('name'),migrate='test_author.table')
    tmp=db.define_table('paper',SQLField
('title'),migrate='test_paper.table')
    tmp=db.define_table('authorship',SQLField
('author_id',db.author),SQLField
('paper_id',db.paper),migrate='test_authorship.table')
    aid=db.author.insert(name='Massimo')
    pid=db.paper.insert(title='QCD')
    tmp=db.authorship.insert(author_id=aid,paper_id=pid)
    authored_papers=db((db.author.id==db.authorship.author_id)&
(db.paper.id==db.authorship.paper_id))
    rows=authored_papers.select(db.author.name,db.paper.title)

    I also get message "SyntaxError:SQLQuery:right site of filter must
be a value or
entity"

On 12月20日, 下午2时53分, sharekey <share...@gmail.com> wrote:
> Hi all,
>
>     I defined a table as below:
>
>     db.define_table('category',
>                 SQLField('parent_id', 'integer'),
>                 SQLField('child_id', 'integer'),
>                 SQLField('sort_id', 'integer'),
>                 SQLField('name'),
>                 SQLField('description'))
>
>     I want to select the records which parent_id=id as:
>     categorys=db(db.dl_category.id==db.dl_category.parent_id).select()
>
>     It don't work on GAE, dev_appserver console output:
>     SyntaxError:SQLQuery:right site of filter must be a value or
> entity
>
>     It work on build-in server, how can I do it on GAE?
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