How to install Rails 2.3.2 and 2.3.4 simultaneously on Ubuntu 9.04?

问题

I need to install Rails 2.3.2 and Rails 2.3.4 simultaneously on my Ubuntu 9.04 server. How do I do this?

When I run:

sudo gem install rails

...it installs version 2.3.4. Is there a single command I can use to also install 2.3.2 parallel to the default (latest) version?

Thanks!

回答1:

use the -v option to gem:

sudo gem install rails -v=2.3.2

you'll have to do a separate install for 2.3.4 though

回答2:

once installed you can specify which version you want to use for a specific rail app by editing the environment.rb file

config/environment.rb

# Specifies gem version of Rails to use when vendor/rails is not present
RAILS_GEM_VERSION = '2.3.4' unless defined? RAILS_GEM_VERSION

来源：https://stackoverflow.com/questions/1637392/how-to-install-rails-2-3-2-and-2-3-4-simultaneously-on-ubuntu-9-04