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Editorial Team
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Asked: 2026-05-26T11:29:14+00:00

I am looking for advise about best practices of generating unique hash strings in

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I am looking for advise about best practices of generating unique hash strings in Ruby/Rails. Usually I use MD5, SHA etc to do this, but it was not quite straightforward to choose source values for hash (timestamps not always prefered to be used).
So my question are:

  1. What values prefered to be used for generating unique hashes? (database column values, timestamps etc)
  2. Are there any gems for this kind of work?

Any advise would be appreciated.

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1 Answer

  1. Editorial Team

    Use UUIDs:

    In ruby 1.9

    require 'securerandom'
SecureRandom.uuid

    In ruby 1.8

    $ gem install uuidtools

UUIDTools::UUID.random_create
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