gem which cannot find gem despite it being installed

Question

I\'ve built my first gem but I don\'t seem to be able to get it to install correctly. I can issue the command

sudo gem install ceilingfish-toto

Answer 1

It's not the hyphen.

gem which searches for library files in gems, not gems. Compare:

$ gem which haml
/home/dave/.gem/ruby/1.8/gems/haml-3.0.12/lib/haml.rb
$ ls haml-3.0.12/lib/h*
haml  haml.rb  haml.rbc

Peachy. Note the existance of lib/haml.rb.

$ gem which rails
ERROR:  Can't find ruby library file or shared library rails
$ ls rails-2.3.8/lib/r*
rails_generator.rb  railties_path.rb  rubyprof_ext.rb  ruby_version_check.rb

There is no lib/rails.rb. But try:

$ gem which railties_path # not a gem
/home/dave/.gem/ruby/1.8/gems/rails-2.3.8/lib/railties_path.rb

So gem which ceilingfish-toto throws an error even when ceilingfish-toto is installed because there is no lib/ceilingfish-toto.rb file (there's not even a lib folder).