Please give me sample, I would like to see it. I don't know how to
google topic you've described (don't understand which  key words use
for search).

On Dec 6, 10:43 pm, Robert Smart <[email protected]>
wrote:
> Normally one should avoid using ReferenceProperty. Best to build a
> key_name from data in the record, or allocate_ids and keep the
> allocated ids in the database (in its parent or in the some other
> record you're bound to use like the record of user data). Then you can
> build the key whenever you need and (importantly) you can build the
> key before the record is stored and use that for various purposes
> (like parenting) without having to have special cases for when the
> record has/hasn't been written yet.

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