From: Brian Candler <b.candler@...>
Date: 2009-12-10T00:36:47+09:00
Subject: Re: upgrade 1.9 then Missing an installed Rails gem?

Arthur Chan wrote:
> arthur:~/workspace/test/test2$ gem list

ruby 1.8 and 1.9 will have their own entirely separate installations of 
gems.

So "gem list" is probably the 1.8 gem command. You need to run the other 
gem command for 1.9: maybe "gem19 list" or "/opt/ruby19/bin/gem list", 
or wherever you installed ruby 1.9 to (remembering that you have to 
install rubygems for ruby 1.9 as well)
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