“Five quick steps to set up RVM with rails 2 and rails3 “

1 – Installing RVM

$ sudo gem install rvm  <br /><br />$ rvm-install  <br />

Finally put this lines in your .bash_profile or .bashrc:

  if [[ -s $HOME/.rvm/scripts/rvm ]] ; then<br />          source $HOME/.rvm/scripts/rvm<br />  fi<br />

Restart your terminal, Rvm should be working by now.

2 – Installing ruby inside your rvm

$ rvm install 1.8.7<br />

Will install ruby 1.8.7

$ rvm install ruby-head<br />

Will install ruby 1.9.2 or newer.

3 – Setting up rvm to use your specific ruby version

$ rvm use 1.8.7<br />

To use just this time.

$ rvm use 1.8.7 --default<br />

To use always this version.

If you are using any other ruby replace the “1.8.7” for your version.

4 – Installing rails 2 and rails 3 RC inside different gemsets

You can separate your rails versions inside gemsets:

Rails 2:

Create the gemset:

$ rvm gemset create rails2<br />

Setting up rvm to use always this gemset:

$ rvm use 1.8.7@rails2 --default<br />

Installing rails 2:

$ gem install rails<br />

Rails 3:

Create the gemset:

$ rvm gemset create rails3<br />

Setting up rvm to use always this gemset:

$rvm use 1.8.7@rails3 --default<br />

Installing rails 3:

$ gem install rails --pre<br />

5 – Switching between different rails versions

Switching to rails 2:

$ rvm use 1.8.7@rails2<br />$ rails -v<br />Rails 2.3.5<br />

Switching to rails 3:

$ rvm use 1.8.7@rails3<br />$ rails -v<br />Rails 3.0.0.rc<br />