Rails keeps telling me that it's not currently installed

Here's what I've done. And the problem is gone. Hence I guess problem solved.

rvm use system

change to the system ruby. remove all gems in it using the command provided and explained [here](

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). then I install wanted ruby versions from scratch:

rvm install 1.8.7
rvm install rails -v 3.0.7

then `bundle install`

for further detail, might need dig into the gem install procedure.

Rails is not reporting that it isn't installed. Your Debian system is telling you that rails isn't installed. One thing about rvm is that it relies on some complicated bash shell scripting and you sometimes need to start a fresh shell for changes to appear. You should also make sure that the correct rvm shell commands were added to your .zshrc file.
Also check your path to make sure the ~/.rvm/gems/... path in included.