How can I run a Rails 1.2.5 application on ruby 1.9?

Question

I have a old app made on rails 1.2.5, this application have alot of access per day.

I intend to upgrade my server (a joyent accelerator) to run ruby 1.9.x and work with rails 3 but I can't stop or move this app to another server.

Have any way to run this application on ruby 1.9? or run two ruby versions (1.8.7 and 1.9) at the same time? or on the last case upgrade my app to work with rails 3?

Thanks.

Answer 1

There was quite a few patches to Rails to make it run under Ruby 1.9. I think you are up for a challenge if you try to do that. With Ruby Version Manager you can work with multiple ruby environments from interpreters to sets of gems .

Answer 2

Does it have to be switched over to Rails3 and Ruby 1.9? Can you just throw you old app on a virtualized server and keep the app running as is?

The reason for my suggestion is that we just went through a similar case. A local business (a construction association) had a pair of apps developed for them 2-3 years ago (works with Rails 1.2.6). Nothing overly major (a billing app, and a bid/contractor/customer management system). Everything works, so no need to update anything.

Their hosting provider was not willing to keep an old outdated rails available in shared hosting environment. Hosting shop cited maintenance can't be streamlined, security concerns, etc. Sure enough, the same host offers to rewrite the apps for current technologies (for a price, of course).

Client wasn't happy with them. The shop that developed the apps since closed and the developers left for greener pastures. But everything works, so why reinvent the wheel, right? Client went looking for alternatives. Came to us. We sat down with the client, did some cost/benefit analysis and decided to just host in a virtualized environment (at another provider). Did that in a week (with some hick-ups): back-up, move, restore, test, everything works. And it's been working now for 3 months without any issues.

This might not work for you, but unless you need to add to the app why fix what ain't broken?

Answer 3

1. Rails 3 works with Ruby 1.8.7
2. Another option (apart from obvious RVM) is to leave your Ruby 1.8.7 and Rails 1.x as is and install latest JRuby and Rails 3.0 and dependent gems with jruby -S gem install rails . Ruby and JRuby gems perfectly coexist without any interference. OpenSolaris in Joyent's Accelerator is good at running Java, so you won't have much problems with it.

PS Btw, I won't recommend updating your Rails 1.x app to 3.x, unless you're planning to add lots of new features to it. It can be very painful, especially if you used lots of old-school gems and plugins.