Re: [Rails] How would you upgrade

On Jun 1, 2013, at 11:23 AM, Warren Prince wrote:

> We have a very large application with probably close to 100K lines of
> code, maybe more. We're still running at 2.3.11, but upgraded to ruby
> 1.9.3. We were trying to step through an upgrade to 3.0 and every time
> we make a little progress it seems Rails or Ruby has released a new
> version, and I can't foresee us every getting caught up as our resources
> are rather limited. I have one assistant working on upgrading and I'm
> always working on bugs and feature requests. I know we should freeze
> the feature requests..... but a full rewrite is so far away, a total
> freeze won't be accepted.
>
> My one thought was to launch a Rails 4 server and try to upgrade in
> sections, using 4.0 for anything we rewrite/fix. Unless someone has
> another thought, can anyone offer any insight as to the best way to run
> two versions in the same app? Obviously, we'd share the db. But would
> I shift back and fourth with route changes or manually write out the
> urls for redirects? Could I share authentication between
> the two servers? Any ideas or precautions would be appreciated. BTW,
> this app is NOT publicly available and is used by a relatively small
> private company internally.
>

Here's one talk from RailsConf which may help you figure out your path:

http://confreaks.com/videos/2425-railsconf2013-changing-the-wheels-on-the-bus-at-80-mph-upgrading-to-rails-3-on-a

And here's another, even more ambitious (Rails 1.x to 4.0):

http://confreaks.com/videos/2490-railsconf2013-the-long-ball-upgrading-long-lived-rails-apps-from-1-x-4-0

Walter



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