upgrading to ruby 1.9.3 with rvm breaks my rails app

Question

I have upgraded ruby using the following commands with rvm:

rvm get head rvm install 1.9.3 rvm reload rvm use 1.9.3 --default

Now when I run rails s I get the following error message:

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:827:in `report_activate_error': Could not find RubyGem rails (>= 0) (Gem::LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:261:in `activate' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:68:in `gem' from /usr/bin/rails:18

If I run which ruby, gem environment, and ruby -v I get coherent output. Could anyone help me understand what is going wrong with my application?

Matthew Rudy · Accepted Answer · 2011-11-01 08:58:06Z

2

Have you tried running gem install rails?

Using RVM with ruby gems means you can have binaries in your PATH (including the rails binary) for gems that are not installed.

This is what your error looks like.

I hope a bundle install or gem install rails will fix your problem.

answered Nov 1, 2011 at 8:58

Matthew Rudy

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4 Comments

tomciopp Over a year ago

I ran gem install rails, and then bundle install but now when I run rails s my command line gets an error and says there is a syntax error in my user model where there wasn't before.(it is saying that there is an unexpected keyword end at the end of my model, which makes no sense to me) I don't know if there is a conflict with devise, or I am just going crazy.

Matthew Rudy Over a year ago

I think that's a different problem. If it's an "unexpected end" error it should be in the file the backtrace shows. If it worked in 1.9.2, I can't think of any syntax changes. Try swapping between the 2 and verifying you havent added a syntax error accidentally.

tomciopp Over a year ago

How do I swap between the two?

tomciopp Over a year ago

Nevermind I figured out the problem and there was an added comma to one of my files that didn't break in 1.9.2 but did in 1.9.3. I deleted it and now the app runs perfectly.

JDutil · Accepted Answer · 2011-11-01 13:28:59Z

You should be able to get your app running again by simply running:

$ bundle

To install your Gemfile dependencies. Then you should run rails server with:

$ bundle exec rails s

It's important to use bundle exec in order to ensure the rails command is running from the proper rails gem for your application.

If you'd like more info on this Yehuda Katz has a detailed blog post: http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/

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