In order to get Rails running correctly on my mac I used this site: http://railsinstaller.org/mac
Which worked great! - RVM is installed and the latest version of Ruby. Unfortunately, I used to use a gem called compass and now it crashes after the new install of RVM.
Is there a way I can just uninstall the old ruby gems I had on Ruby 1.8.7 and reinstall them using the new version of Ruby 1.9.3 I have installed?
when I type gem uninstall compass it says I don't have it installed. How do I run the gem command from the old version of Ruby? (I'll have to do this for compass and susy and the like)
In fact - can I get a list of all previously installed gems and uninstall all of them?
Use rvm use system to change back to the system RVM and gems to uninstall things and list them (gem list).
After listing them, you can go install them in the 1.9.3 environment (via normal gem install, perhaps with a long list of the gems from the system set)