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Editorial Team
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Asked: 2026-05-14T15:04:55+00:00

I have installed the gem ‘simple_uuid’ but nothing seems to be working. Using irb

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I have installed the gem ‘simple_uuid’ but nothing seems to be working.

Using irb and running the following:

require 'rubygems'
require 'simple_uuid'

is fine, both return true. But running the following:

// Class added by simple_uuid
UUID.new

returns

NameError: uninitialized constant UUID
    from (irb):3
    from :0

I’m a ruby newbie, so don’t assume much in the answers. Thanks.

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1 Answer

  1. Editorial Team

    The class is inside a module SimpleUUID. So either do “include SimpleUUID” after the require, or refer to the class with the full namespace: SimpleUUID::UUID

    require 'rubygems'
require 'simple_uuid'

> UUID.new
NameError: uninitialized constant UUID
        from (irb):3

> SimpleUUID::UUID.new
 => <UUID#70305762670060 time: Sat May 01 21:11:28 +0200 2010, usecs: 843284 jitter: 13605115058679102872>
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