I'm currently evaluating RubyMine and IntelliJ IDEA. I already own PHPStorm and would like to go with IntelliJ IDEA instead of purchasing an IDE for each language I use.
I created a Rails project using the command line in Terminal (OS X 10.8.4), installed gems and then pointed RubyMine to it. I have no problem using RubyMine developing the project or running the test server. When I quit RubyMine and open the same project in IntelliJ IDEA, the app complains about a missing Ruby SDK. The only one it sees it the version installed with the OS, which is getting pretty long in the tooth. I've intstalled the lastest versions of Ruby using rbenv. Rbenv keeps the versions in a hidden directory. You use a command line entry to set the one you want to use for a given project. Could it be that RubyMine has been updated to recogize this environment and IntelliJ IDEA hasn't?