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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