Force Ruby Version

Question

I just got burned because I used find_index on an array on my dev box (OSX with Ruby 1.8.7) and the deployment machine runs Ruby 1.8.6. (What's the difference between find_index and index? The latter works on 1.8.7 and 1.8.6)

So that got me thinking: what's the best way to force Rails to run with a specific Ruby version?

Since it's probably relevant (install multiple rubys!), I need to know this for OSX, but it would be useful to know for Linux, Windows, and Commodore 64 as well.

Later: Of course I'm working in a virtual appliance now, but I'd like to be able to control my Ruby versions if possible on my computer.

Note: I don't care too much disallowing Rails running with the wrong Ruby version. I'm more interested in getting the RIGHT ruby version to run. Sorry for the confusion.

Answer 1

This won't force the version of ruby required but you may want to utilize something like RVM to easily manage your ruby environment on your dev and production boxes.

http://rvm.io/

This allows you to easily switch and maintain multiple versions of ruby on your system.