Updating to Rails 3 on Mac OS X

While trying to install Rails 3, I get the followi开发者_JAVA百科ng error:

command run: sudo gem install rails --pre

error'd now with:

Successfully installed rails-3.0.0.rc2
1 gem installed
Installing ri documentation for rails-3.0.0.rc2...
File not found: lib

Or if you don't want to worry about running versions side by side you can do

gem update rails

At least it worked for me.

Rails 3 is out of beta/rc now, so try:

gem install rails --version 3.0.0

It should work on Ruby 1.8.7 and 1.9.2-p0.

I haven't personally seen that issue, but you could try and get around it by using the --no-ri option.

sudo gem install rails --pre --no-ri

There's also a --no-rdoc option if you have trouble with that too.