From: Brian Candler <b.candler@...>
Date: 2009-10-13T19:08:06+09:00
Subject: Re: uninitialized constant ActionController (NameError)

Martin G端tlein wrote:
> Hello,
> 
> My ruby cannot find a class from the actionpack gem:

Rails questions are best asked on a Rails mailing list. This list is for 
Ruby (the programming language). A smart question would also say what 
exact version of Rails you are using, and on what platform.

But I would make the following comment: require 'foo' doesn't 
necessarily load everything inside the 'foo' package. It loads exactly 
what foo.rb tells it to load. You will need to look at the source of 
foo.rb to see if it loads what you want, and if it doesn't, you'll need 
to load what you want yourself.

>> require 'rubygems'
=> true
>> require 'actionpack'
=> true
>> ActionController::Session::AbstractStore
NameError: uninitialized constant ActionController
        from (irb):3
>> require 'action_controller'
=> true
>> ActionController::Session::AbstractStore
=> ActionController::Session::AbstractStore
>> 

[This is with rails-2.3.2 under Ubuntu Hardy with ruby-1.8.6p111 
compiled from source]

And you can see why easily:

$ cat /usr/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/actionpack.rb
require 'action_pack'

$ cat /usr/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_pack.rb
<< snip copyright message >>
require 'action_pack/version'

$ cat 
/usr/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_pack/version.rb
module ActionPack #:nodoc:
  module VERSION #:nodoc:
    MAJOR = 2
    MINOR = 3
    TINY  = 2

    STRING = [MAJOR, MINOR, TINY].join('.')
  end
end

So if you require 'actionpack', that's exactly all you will get.
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