r.uuid([string]) → string
Return a UUID (universally unique identifier), a string that can be used as a unique ID. If a string is passed to uuid as an argument, the UUID will be deterministic, derived from the string’s SHA-1 hash.
RethinkDB’s UUIDs are standards-compliant. Without the optional argument, a version 4 random UUID will be generated; with that argument, a version 5 UUID will be generated, using a fixed namespace UUID of 91461c99-f89d-49d2-af96-d8e2e14e9b58. For more information, read Wikipedia’s UUID article.
Please take into consideration when you generating version 5 UUIDs can’t be considered guaranteed unique if they’re computing based on user data because they use SHA-1 algorithm.
Example: Generate a UUID.
> r.uuid().run(conn, callback)
// result returned to callback
"27961a0e-f4e8-4eb3-bf95-c5203e1d87b9"
Example: Generate a UUID based on a string.
> r.uuid("slava@example.com").run(conn, callback)
// Result passed to callback
"90691cbc-b5ea-5826-ae98-951e30fc3b2d"
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