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Shedding some light into UUID version 4 in Ruby and Rails

Blog of Marian Posaceanu - Multidisciplinary web developer - core programming language used : Ruby · published 5 July 2025

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https://www.rfc-editor.org/rfc/rfc9562.html

rfc-editor.org

https://docs.ruby-lang.org/en/master/SecureRandom.html

docs.ruby-lang.org

https://www.postgresql.org/docs/current/functions-uuid.html

postgresql.org

https://github.com/ruby/ruby/blob/trunk/lib/securerandom.rb

github.com

https://github.com/rails/rails/blob/4-2-stable/activerecord/lib/active_record/connection_adapters/postgresql/schema_definitions.rb

github.com

http://www.ietf.org/rfc/rfc4122.txt

ietf.org

http://security.stackexchange.com/a/47882

security.stackexchange.com

https://github.com/sporkmonger/uuidtools

github.com

http://www.2uo.de/myths-about-urandom

2uo.de

http://programmers.stackexchange.com/questions/130261/uuid-collisions

programmers.stackexchange.com

http://www0.cs.ucl.ac.uk/staff/d.jones/GoodPracticeRNG.pdf

www0.cs.ucl.ac.uk

https://github.com/ruby/ruby/blob/trunk/random.c

github.com