From: Paul McKibbin <paul@...>
Date: 2010-05-21T08:10:10+09:00
Subject: Re: class arrays

On 2010-05-18 15:53:02 +0100, poseid said:

> On 18 Mai, 16:00, MrZombie <mrzom...@thezombie.net> wrote:
>> 
>> Erh, not that way. Sorry.
>> 
>> You could have
>> 
>> class A
>> �@b = [1,2,3]
>> end
>> 
>> Which stores the array in a class-level instance variable.
>> 
>> This other one
>> class A
>> �@@b = [1,2,3]
>> end
>> 
>> stores the array in a class variable.
>> 
> 
> 
> Hm... ok, this is more or less what I expected as well, when reading
> code employing instance/class variables. But how do I understand the
> (old) code from a book on Rails:
> 
> class T < ActionView::Helpers::FormBuilder
>   field_helpers.each do |s|
>       src = <<-END_SRC
>          def #{s}(field, options = {})
>            @template.content_tag( ... )
>          end
>       END_SRC
>   class_eval src, __FILE__, __LINE__
>  end
> end
> 
> To me it seems that field_helpers is an instance variable, but there
> is no @ nor @@ used
> 
> thanks for feedback

I'm not familiar with the old actionview methods, but it strikes me 
that the most likely reason is that field_helpers is a class method 
that returns an array of strings. Sort of like

def self.field_helpers
  %w(list of desired words)
end

or something to that effect. You could check that by grepping the 
methods that T has.

Mac