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Editorial Team
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Asked: 2026-06-13T09:12:55+00:00

When I create an object with ndb’s method put it creates the key automatically

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When I create an object with ndb’s method put it creates the key automatically of the type Key(kind, id) where id is a number. All over the documentation it shows that you can use a string for the key’s id but I couldn’t find out how to do this automatically when an object is created.

I have a User model and I was thinking to use the user’s username (since its unique) as the key’s id for faster retrieval. Is that even a good idea? Would I have any problems with the username since it’s user submited (i’m validating the input)?

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1 Answer

  1. Editorial Team
    class UserModel(ndb.Model):
  ...

user_model_entity = UserModel(id='some_string', ...)

    If these IDs are subject to change, this may be a bad idea. If it’s your own system and you can react to potential changes, it is a fine idea, but you need make sure the IDs will be unique and relatively stable before deciding to use them.

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