Firestore: How to create Document with Custom ID, but only if it doesn't exist?

Asked Jun 25 '23 at 01:22

Active Jun 25 '23 at 01:30

Viewed 16 times

Does anyone know how to create a Firestore Document with a specific, non-autogenerated ID? I would like the operation to fail if the document already exists, and I would like this to be a single operation (not one involving two reads)

Looking for Javascript solutions. Preferably with the web modular API (v9). I'm not sure how to find the source code for addDoc, so I don't know how to mimic the addDoc process with my own ID.

setDoc is not a solution to this problem, unless there is a way to make it fail if the document already exists. The default behaviour of setDoc is to either merge or replace existing documents, not "fail if exists".

edited Jun 25 '23 at 01:30

Doug Stevenson

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asked Jun 25 '23 at 01:22

touch my body

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I don't think that's possible but what about checking if document is there, and if no create it using `setDoc`? – Kevin M. Mansour Jun 25 '23 at 01:28
You have to explicitly check to see if it exists first. You can do that in a transaction if you need the check-and-set to be atomic. – Doug Stevenson Jun 25 '23 at 01:29

Firestore: How to create Document with Custom ID, but only if it doesn't exist?

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