I started using Rails after Tiger came out so I haven't been through a major upgrade since using it.
I'm a little concerned on what upgrading will do to my development environment. I even heard that the new OS would even have Rails already installed on it, but I don't want it to overwrite the versions I have installed already.
Is there any advice and what I need to do in order to prepare for the upgrade?
Thanks.
Leopard will have Ruby 1.8.6, Rails 1.2.x, Mongel, Capistrano and Subversion pre-installed as "first-class" citizens into the OS core. Meaning they don't live in /usr/local nor /opt directories. I believe they are installed in /bin. So you shouldn't have to worry about it overwriting your installation. Just make sure your install directory shows up before /bin in the system $PATH environment variable.
That being said, given that Leopard will include nearly the latest releases of Ruby (and not a broken one) and Rails with most of the standard goodies, why not just use them. If they are not completely up to date just use RubyGems to update them. This is what I'll do once Leopard is released. Heck as much attention as Apple is putting into Rails these days, we just might see them upgrade as Rails does with the standard software update mechanism (one could dream anyway).