From: Brian Candler <b.candler@...>
Date: 2010-03-30T23:44:05+09:00
Subject: Re: Using of module and "Is not missing constant" error

> I create a test app with this code.
> In app/controller/local/class_generator_controller.rb :
> 
> class Local::VerticalGeneratorController < ApplicationController
>   def index
>     @models = VerticalBuilder::Vertical.list
>     @models = VerticalBuilder::Vertical.list #second call raise an 
> exception
>   end
> end

Try rewriting this as:

module Local
class VerticalGeneratorController < ApplicationController
  ...
end
end

I have seen similar constant lookup problems before.

$ irb --simple-prompt
>> class Foo
>> ZZZ = 123
>> end
=> 123
>> class Foo::Bar
>> def baz
>> puts ZZZ
>> end
>> end
=> nil
>> Foo::Bar.new.baz
NameError: uninitialized constant Foo::Bar::ZZZ
  from (irb):6:in `baz'
  from (irb):9
  from :0

Compare:

$ irb --simple-prompt
>> class Foo
>> ZZZ = 123
>> end
=> 123
>> class Foo
>> class Bar
>> def baz
>> puts ZZZ
>> end
>> end
>> end
=> nil
>> Foo::Bar.new.baz
123
=> nil
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