When should I use update() over set()? With set() and merge : true, I can do exact the same thing as update() and it is guaranteed it will not fail, while update() will fail if the document does not exist.
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J. Doe
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You question have already been answered in this topic: https://stackoverflow.com/a/46600599/7674708 – Frederiko Ribeiro Feb 01 '18 at 00:30