I wrote some custom properties awhile back which may help:

http://gist.github.com/109193

They are untested, so proceed with caution.

On Jun 7, 12:29 am, Tom Wu <[email protected]> wrote:
> Hi All,
>
> Since the db.key is auto generate by system. We can't assign the value of
> db.key.
>
> If ReferenceProperty can reference with key_name, it will make easier for us
> to backup and restore the Reference model.
>
> Just a idea for me, Any suggestion will be appreciated.
>
> Best Regards
> Tom Wu
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