why not adding a ListProperty to Author which holds the list of
genres for that
author? Of course, you need to keep it updated in each
Create/Update/Delete of books
associated with that author, but it would allow you to query just for
author.favgenre='sci-fi'.
Maybe it looks strange coming from the SQL world where you can Join
things and so on,
but I believe that it makes sense to work like that in the DataStore world...

        best,
       Jose

On Thu, Sep 18, 2008 at 1:16 PM, Arun Shanker Prasad
<[EMAIL PROTECTED]> wrote:
>
> Hi Marzia,
>
> Thanks for the reply.
> In my particular situation I needed a list of Authors who have the
> favGenre='Sci-Fi'..

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