Rails :
1) gem Gemfile
gem 'rails','3.2.8' gem 'rails', '4.0.2'
2) bundle install. , .
3) rails 4.0.2: rails 3.2.8 , 'bundle update rails', , .
If you want to run these projects in different ruby ββversions, then on Linux platforms RVM- the best option. But on Windows, RVM will not work. A good option would be a tool Pik. Pik is a tool for managing multiple versions of ruby ββon Windows.
Please refer here for the same. Hope this helps :)
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