uuid

uuid()

Class Public methods

::uuid generates a v4 random UUID (Universally Unique IDentifier).

p SecureRandom.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594"
p SecureRandom.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
p SecureRandom.uuid #=> "62936e70-1815-439b-bf89-8492855a7e6b"

The version 4 UUID is purely random (except the version). It doesn't contain meaningful information such as MAC address, time, etc.

See RFC 4122 for details of UUID.

Links:

https://github.com/ruby/ruby/blob/3207af4cb841872176ad0ba5cc62f868b83ee769/lib/securerandom.rb#L247

doc_ruby_on_rails

2015-05-14 06:08:22

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