From: Martin DeMello <martindemello@...>
Date: 2007-07-17T04:05:48+09:00
Subject: Re: Odd requirement behavior between two environments

On 7/17/07, Ian Whitney <iwhitney@ssa-i.org> wrote:
> New development machine where this doesn't work
>     Ruby 1.8.6
>     Gems 0.9.4
>     ActiveRecord gem installed 1.15.3
>
> Results of IRB session on the new development machine
>
> irb(main):001:0> require 'rubygems'
> => true
> irb(main):002:0> gem 'activerecord'
> => true
> irb(main):003:0> ActiveRecord
> NameError: uninitialized constant ActiveRecord
>         from (irb):3

"gem" doesn't perform an implicit require; it simply modifies $: to
include the path to the gem.

irb(main):001:0> old = $:.dup
=> ["/usr/lib/ruby/site_ruby/1.8",
"/usr/lib/ruby/site_ruby/1.8/i686-linux", "/usr/lib/ruby/site_ruby",
"/usr/lib/ruby/1.8", "/usr/lib/ruby/1.8/i686-linux", "."]
irb(main):002:0> require 'rubygems'
=> true
irb(main):003:0> gem 'activerecord'
=> true
irb(main):004:0> $: - old
=> ["/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/bin",
"/usr/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib",
"/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/bin",
"/usr/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib"]
irb(main):005:0> require 'activerecord'
LoadError: no such file to load -- activerecord
        from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
        from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
        from (irb):5
irb(main):006:0> require 'active_record' #sheesh
=> true
irb(main):007:0> ActiveRecord
=> ActiveRecord

martin