# How to define ID as char(22)

**URL:** <https://www.ruby-forum.com/t/how-to-define-id-as-char-22/123535>\
**Category:** Rails\
**Created:** [December 18, 2007, 3:32pm UTC](https://www.ruby-forum.com/t/how-to-define-id-as-char-22/123535 "2007-12-18T15:32:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dcarneiro](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/e36b37/32.png) [@dcarneiro](https://www.ruby-forum.com/u/dcarneiro)\
**Post date:** [December 18, 2007, 3:32pm UTC](https://www.ruby-forum.com/t/how-to-define-id-as-char-22/123535/1 "2007-12-18T15:32:08Z")

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Hi guys,  
I am newer of ROR. I want to use UUID in my project but I don’t  
know where and how to define ID as char(22).  
Any one can help me?  
Thanks a lot!

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<div class="post-metadata">

**Author:** ![dcarneiro](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/e36b37/32.png) [@dcarneiro](https://www.ruby-forum.com/u/dcarneiro)\
**Post date:** [August 19, 2008, 8:04am UTC](https://www.ruby-forum.com/t/how-to-define-id-as-char-22/123535/2 "2008-08-19T08:04:50Z")

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Daniel C. wrote:

> Hi guys,  
> I am newer of ROR. I want to use UUID in my project but I don’t  
> know where and how to define ID as char(22).  
> Any one can help me?  
> Thanks a lot!

Refer [http://rorexperts.com/viewtopic.php?t=110&highlight=](http://rorexperts.com/viewtopic.php?t=110&highlight=)