ruby - rails new project_name using rvm -

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i use rvm in rails project , specify gem versions in gemfile.

however, problem right different. want create rails 3.1 project using rails new project_name current version of rails rails 3.0.3

i know can update rails gem version future executions of rails new project_name create 3.1 project?

how can set things can create rails 3.1 projects while other times creating rails 3.0 projects?

rvm 1.9.2 rvm gemset create rails310 rails303 rvm 1.9.2@rails310 gem install rails -v 3.1.0 rails new my_310_app  rvm 1.9.2@rails303 gem install rails -v 3.0.3 rails new my_303_app

http://beginrescueend.com/gemsets/basics/


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