Upgrading from Rails 1.2.3 to Rails 2.3.3

I was upgrading a Rails 1.2.3 app to Rails 2.3.3 and I thought about documenting what I had to do for future reference. I was following Peter Marklund's article to upgrade to Rails 2.3.2 which I also followed to upgrade. However, I want to cover the many little things that will make your app not work in 2.3.

Upgrading to Rails 2.3.2 should be straightforward.

Modify config/enviornment.rb and change the following:

RAILS_GEM_VERSION = '2.3.3' unless defined? RAILS_GEM_VERSION

Delete vendor/rails
Run:
```
rake rails:freeze:edge RELEASE=2.3.3
```
and
```
rake rails:update
```
. This should place a new version of rails. From here on follow Marklund's article to finish off the rest of the solution.

The main differences between Rails 1.2 and 2 are the many deprecated calls that need to be addressed. Here knowing sed is a godsend. A command like the following

find  app/ -exec sed -i '' 's/A/B/g' {} \; -print

where A is the search and B is the replace works wonders.

Here are some common changes that need to be addressed in transitioning and need to be replaced for your app to work.

 s/@request/request/g
 s/redirect_to_url/redirect_to/g
 s/find_first/first/g
 s/find_all/all/g

Also, Rails 1.2 allowed the use of non-Restful urls which I must say are a bitch to fix if they were hardcoded. But that is the state of life...

Tags » rails upgrading

23 July 2009
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Upgrading from Rails 1.2.3 to Rails 2.3.3

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