Install Rails 3.1 beta with RVM gemsets (a public service announcement)
May 08, 2011
Last summer, as the early releases of Rails 3.0 began rolling out, I shared how to use RVM to create sandboxes for experimenting with new versions of gems. Fast forward to now—Rails 3.1 is coming our way soon, with some major changes under the hood. These changes are well documented and debated elsewhere, so I won’t get into them here. Once again, there’s no need to wait until 3.1 goes final to see what’s different. Here’s a quick rundown of how to install your own Rails 3.1 sandbox.
First, if you haven’t updated RVM in awhile, it doesn’t hurt to do so now.
At this writing, RVM is at version 1.6.5. Don’t forget, you’ll need to open a new terminal window to begin using the new version.
Create a gemset for the beta software:
$ rvm gemset create rails31beta
Switch to the newly-minted gemset with
Now install Rails 3.1 beta:
$ gem install rails --pre
and create a test application:
We’re almost done. Next create a
.rvmrc file to tell RVM which gemset to use in the new application. Note that I’m using Ruby 1.9.2, which I believe is now a requirement in Rails 3.1.
$ echo "rvm use 192@rails31beta" > mytestapp/.rvmrc
Open the application’s directory, run
bundle to install the default gems, and you’re off to the races.
As you look around the application structure, take a look at your
Gemfile and the new
assets directory inside
app/. This is where most of the new features that will affect Rails developers at all levels are located.
Where to go from here?
- The Sass tutorial should get you up and running with replacing your CSS. I’ve been using Sass for awhile now and love it—if you haven’t checked it out yet, you owe it to yourself to do so.
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