Ruby on Rails

I upgraded an app from rails 1.2.3 to rails 3. First, I installed RVM
with both Rails versions (gemset: rails1.2.3 and rails3.0.0), I
created a new Rails 3 app from scratch and I was adding the
controllers (helpers, views, etc) one by one. It was a lot of work but
I was sure that all things were working OK.

When you do that, you can refactor/update/remove....etc and you'll be
sure you didn't touch the working app. And you need some source
control system (svn or git are OK), just in case you do something
wrong.

Exequiel.

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