Ruby on Rails Beta 3 Install on Snow Leopard - file not found

Question

I tried to install the new beta on my system with the command:

sudo gem install rails --pre

but no matter what I tried, I still get this damn error:

Successfully installed rails-3.0.0.beta3
1 gem installed
Installing ri documentation for rails-3.0.0.beta3...
File not found: lib

Since I'm very new to ruby, I really don't know what to do.

How can I finish installing this? Is this installed already? Why does it abort here?

Answer 1

All you need to run is gem install rdoc, follow its instructions, then run the install rails command again and you're good. The problem is due to rdoc failing to install when installed with rails, if installed manually it works fine.

Source: http://gist.github.com/565967

^ I had the same problem, and this worked for me.

Answer 2

If you're looking to do ruby/rails development on Mac, I'd strongly recommend not using the version of ruby/rubygems shipped with your mac. What I do recommend is:

1. Installing homebrew and using that to manage software packages on your mac.
2. Install brewbygems, which makes homebrew play nice with rubygems: gem install brewbygems
3. Install rvm and learn to love the different versions of ruby and rvm's gemsets feature: gem install rvm

Once you've done that you'll have a pretty robust development environment and you should be able to install any version of rails without a problem. Just keep in mind rails 3 works best using ruby 1.9.2 (install with rvm by running rvm install ruby-head) and is still in beta, meaning it isn't terribly stable and should not be used for anything production grade (yet).