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    David Kimura PRO said almost 7 years ago on UUID in Rails with ActiveUUID :

    You could use a UUID for this, but I think that it would probably be a bit overkill.

    I would personally just do something like this with SecureRandom.hex (which is part of the ruby core)

            before_create :populate_subscriber_id
            private
            def populate_subscriber_id
              begin
                self.subscriber_id = SecureRandom.hex
              end while self.class.exists?(subscriber_id: subscriber_id)
            end
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