# Migrating rails 2.2.2 to 2.3.2

**URL:** <https://www.ruby-forum.com/t/migrating-rails-2-2-2-to-2-3-2/166640>\
**Category:** Rails\
**Created:** [April 28, 2009, 4:52am UTC](https://www.ruby-forum.com/t/migrating-rails-2-2-2-to-2-3-2/166640 "2009-04-28T04:52:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Don\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/f04885/32.png) [@Don\_F](https://www.ruby-forum.com/u/Don_F)\
**Post date:** [April 28, 2009, 4:52am UTC](https://www.ruby-forum.com/t/migrating-rails-2-2-2-to-2-3-2/166640/1 "2009-04-28T04:52:15Z")

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I tried to just change the rails gem I use with my application and I  
got the following error:  
/usr/local/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/  
active\_support/core\_ext/module/aliasing.rb:33:in `alias_method': undefined method`template\_exists?’ for class  
`ActionController::Base’ (NameError)

I can create a new project and it starts fine. Where is this error  
coming from? Are there certain steps to migrate from 2.2.2 to 2.3.2?

Don F.

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**Author:** ![Don\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/f04885/32.png) [@Don\_F](https://www.ruby-forum.com/u/Don_F)\
**Post date:** [April 28, 2009, 8:54am UTC](https://www.ruby-forum.com/t/migrating-rails-2-2-2-to-2-3-2/166640/2 "2009-04-28T08:54:52Z")

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Hi Don,

This document helped me to migrate from 2.1 to 2.3:

> **[Ruby on Rails 2.3 Release Notes — Ruby on Rails Guides](https://guides.rubyonrails.org/2_3_release_notes.html)**
>
> Ruby on Rails 2.3 Release NotesRails 2.3 delivers a variety of new and improved features, including pervasive Rack integration, refreshed support for Rails Engines, nested transactions for Active Record, dynamic and default scopes, unified rendering,...

I also found a Google search on ‘rails 2.3 ’ very useful.

CmdJohnson

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**Author:** ![Don\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/f04885/32.png) [@Don\_F](https://www.ruby-forum.com/u/Don_F)\
**Post date:** [April 28, 2009, 8:59am UTC](https://www.ruby-forum.com/t/migrating-rails-2-2-2-to-2-3-2/166640/3 "2009-04-28T08:59:34Z")

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Oh and don’t forget rake rails:update!

On Tue, Apr 28, 2009 at 8:54 AM, Commander J. \<