Rails

• Rails API
• Rails Guides
• Pragmatic Programmers Rails 4
• Railscasts

Installing Rails 4.0 on MacOS X

1. Get Homebrew.
   • Homebrew installs software into /usr/local, so you might need sudo-powers to install it, but -- once installed -- all Homebrew installations shouldn't need sudo at all.
2. brew install ruby
   • Since this will install Ruby into /usr/local, OS X's system Ruby (1.8.7) will be untouched.
   • Run ruby --version to make sure you have Ruby 2.0.
3. Add /usr/local/Cellar/ruby/2.0.0-p0/bin to your PATH (mine is in ~/.bash_profile). You need to open a new terminal or start a new shell after this.
   • If you miss this step (like I did), running rails will call your system rails (/usr/bin/rails), which will ask you to install rails using sudo. Don't believe it.
4. gem install rails
   • If this step works correctly, the rails binary will be installed into /usr/local/Cellar/ruby/2.0.0-p0/bin, so if that's in your path, running rails -v will report that you have rails 4.0 installed.
5. Use which rails to make sure your path to the rails binary is correct -- it should *not* be in /usr/bin!

Related Ruby stuff

• Ruby Version Manager
• Ruby Toolbox