you need an entity group
http://code.google.com/appengine/docs/java/datastore/jdo/relationships.html
or cross group transactions if you are using the HR datastore:
http://code.google.com/appengine/docs/python/datastore/transactions.html
or If you are not on the HR datastore and need 2-phase locking
transactions:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/497060c343e16052/18f8603e9ffe3db4?lnk=gst&q=Good+point+++nichole#18f8603e9ffe3db4
On Feb 1, 10:25 am, John Goche <johngoch...@googlemail.com> wrote:
> Hi,
>
> I've raised the issue with a test case in google's issue tracker:
>
> http://code.google.com/p/datanucleus-appengine/issues/detail?id=259
>
> I am hoping someone can kindly have a look at it and get back to me
>
> as I cannot see how I can make use of JDO on app engine without this fixed.
>
> In the meantime any suggestions on how to work around the problem would
>
> be greatly appreciated.
>
> Kind Regards,
>
> John Goche
>
>
>
>
>
>
>
> On Wed, Feb 1, 2012 at 9:21 AM, datanucleus <andy_jeffer...@yahoo.com> wrote:
> > So it can't find a related Entity. You could obviously use the DB
> > viewer (or a low level API call) to check whether it is present (with
> > that Key), and look in the log for whether it was PUT.
>
> > Can't speak for Google but I'm sure nobody has interest in private
> > code, though I'm sure that it ought to be perfectly simple to generate
> > a testcase something akin to the format used by DataNucleus
> >http://www.datanucleus.org/project/problem_jdo_testcase.html
> > if the issue is as clear as you say in terms of reproducing it. And
> > then you can raise an issue in Googles issue tracker with the
> > testcase; obviously without the testcase then nobody, other than you,
> > can see it.
>
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