# Extension migrations in reverse

**URL:** <https://www.ruby-forum.com/t/extension-migrations-in-reverse/109336>\
**Category:** Radiant CMS\
**Created:** [July 13, 2007, 3:25pm UTC](https://www.ruby-forum.com/t/extension-migrations-in-reverse/109336 "2007-07-13T15:25:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [July 13, 2007, 3:25pm UTC](https://www.ruby-forum.com/t/extension-migrations-in-reverse/109336/1 "2007-07-13T15:25:33Z")

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I was going to ask how to do this, because this did not appear to work  
as expected:

% rake db:migrate:extensions VERSION=XX

(it seems to completely ignore the version number.)

However, i poked around in the source and discovered what i think is  
my answer. I have added the following to the Extensions tutorial in  
the wiki (does it belong there?) but _please_ _please_ correct any  
mistakes I have made. I’ve only been using radiant for a short time.

(also please move this to somewhere more appropriate & link to it in  
the wiki if you fee that would be more appropriate.)

This is what i have added to the Extensions tutorial on the wiki:

(Note: You can safely ignore this for now, but: Later, if you want to  
migrate your database to a specific version of your extension’s schema  
(for example an earlier version to roll-back changes), you must use  
the migration task that was generated specifically for your extension,  
for example:

% rake production radiant:extensions:link\_roll:migrate VERSION=0

The version number corresponds to the number of your extension’s  
migration (file), not the version number in the schema\_info table. )

---

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**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\
**Post date:** [July 13, 2007, 3:53pm UTC](https://www.ruby-forum.com/t/extension-migrations-in-reverse/109336/2 "2007-07-13T15:53:37Z")

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Mark,

That is correct. It would be awesome if you could update the wiki with  
that.

Sean