RubyGems break because Ruby has both site_ruby and vendor_ruby

I just installed Ruby and RubyGems using MacPorts and a whole bunch of gems. I am trying to run a Rails project that works on Ubuntu, but now I am trying to make it run on Leopard. I got an error when I just run script/console:

jamison:redesign rlaw$ script/console Loading development environment. /opt/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/ active_support/dependencies.rb:477:in `const_missing':NameError: uninitialized constant Gem::Version::NUM_RE

I find it awk Gem::Version::NUM_RE is not initialized. I then traced and found that I have two Ruby directories:

jamison:ruby rlaw$ ls -alF total 0 drwxr-xr-x 6 root admin 204 Dec 2 13:55 ./ drwxrwxr-x 167 root admin 5678 Dec 1 07:14 ../ drwxr-xr-x 111 root admin 3774 Dec 1 03:47 1.8/ drwxr-xr-x 3 root admin 102 Dec 1 04:01 gems/ drwxr-xr-x 4 root admin 136 Dec 1 03:47 site_ruby/ drwxr-xr-x 4 root admin 136 Dec 1 03:47 vendor_ruby/

And my Ruby $LOAD_PATH is as follow:


/opt/local/lib/ruby/site_ruby/1.8 /opt/local/lib/ruby/site_ruby/1.8/i686-darwin9.1.0 /opt/local/lib/ruby/site_ruby /opt/local/lib/ruby/vendor_ruby/1.8 /opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin9.1.0 /opt/local/lib/ruby/vendor_ruby /opt/local/lib/ruby/1.8 /opt/local/lib/ruby/1.8/i686-darwin9.1.0 .

Things in site_ruby and vendor_ruby are obviously different. Specifically, /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/version.rb has NUM_RE defined but /opt/local/lib/ruby/site_ruby/1.8/rubygems/ version.rb does not. Since Ruby looks in site_ruby first, that's exactly why it breaks. So my solution is to swap site_ruby and vendor_ruby, and it works.

However, why are there two directories, site_ruby and vendor_ruby? How did it end up like this? Is there any repercussion if I swap them?


I fixed this on my project by putting this in my environment above the initializer:

module Gem   class Version     NUM_RE = /\s*(\d+(\.\d+)*)*\s*/   end end

- Ola