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A comment on Race conditions on Facebook, DigitalOcean and others (fixed). Parent comment

Re:Race conditions on Facebook, DigitalOcean and others (fixed) by kawsper on Monday April 27, 2015 @02:24PM (#9448199)
Read the part "Concurrency and integrity" in the Rails documentation: http://apidock.com/rails/ActiveRecord/Validations/ClassMetho...

You need to enforce the uniqueness in the DB.

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