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Editorial Team
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Asked: 2026-05-28T08:30:19+00:00

I think I read something about a function appengine has that can tell whether

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I think I read something about a function appengine has that can tell whether an ID / key you want to use for an entity is available, or if there was a function to get an available ID to choose. App engine team said also that we should set the ID when the entity is created and not change it. But in practice we can just copy everything to a new entity with the new ID?

Thanks!

Update

I think the function I’m looking for is allocateIDs from the docs:
http://code.google.com/appengine/docs/python/datastore/functions.html

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  1. Editorial Team

    To reserve one or more IDs, use allocate_ids(). To check whether an ID is already taken, just construct a Key for it using Key.from_path(kind, id) and try to db.get() it. Also note that IDs for keys with a parent are taken from separate pools and are only unique among keys with the same parent.

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