From: Robert Klemme <shortcutter@...>
Date: 2006-10-18T21:40:09+09:00
Subject: Re: Struct (not) accepting attributes

On 18.10.2006 14:33, Kero wrote:
>> Sum = Struct.new(:bla, :"sum(value)")
>> sum = Sum.new(2, 5)
> => #<struct Sum bla=2, :"sum(value)"=5>
>> sum.send(:"sum(value)")
> NoMethodError: undefined method `sum(value)' for #<struct Sum bla=2, :"sum(value)"=5>
>> class X
>>   attr_accessor :"sum(value)"
>> end
> NameError: invalid attribute name `sum(value)'
>> class Sum
>>   define_method(:"sum(value)") { "summum!" }
>> end
> => #<Proc:0xa7c5f218@(irb):181>
>> sum.send(:"sum(value)")
> => "summum!"
> 
> Not sure this is an error in ruby (1.8.5) or a misunderstanding from me (about Struct).

There is another option: a misunderstanding on your side which attribute 
names can be used in this situation / generally.  As you see your sample 
class X does not work either.

Why don't you just use "sum_value" as attribute name?

Kind regards

	robert