I just followed these directions for installing a new rvm gemset and installing rails-3.1.0.rc2 on my local machine. At first I was getting a Passenger error saying the rake-0.9.2 gem could not be loaded, but I found for installing
阅读背景：
使用乘客同时运行Rails 3.0和rails3.1 app(使用不同的rvm gemsets)
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