From: Adam Gardner <adam.oddfellow@...>
Date: 2009-05-16T04:18:05+09:00
Subject: Re: obj.attr(qualifier) = value -- possible?

Rick Denatale wrote:
> On Fri, May 15, 2009 at 3:00 PM, Michael Schuerig <michael@schuerig.de> 
> wrote:
>> �end
>> � � �...
>> � �end
>> �end
>> end
>>
>> Neither is valid Ruby, apparently. Is there another, working way?
> 
> I don't think you can get the calling syntax you want.  The best you
> can do I think is
> 
> obj.attr = qualifier, value
> 

Well, you could always go with obj.attr[qualifier] = value

irb(main):004:0> class Ooo
irb(main):005:1> attr_reader :attr
irb(main):006:1> def initialize
irb(main):007:2> @attr = {}
irb(main):008:2> end
irb(main):009:1> end
=> nil
irb(main):010:0> obj = Ooo.new
=> #<Ooo:0x6fe6b8 @attr={}>
irb(main):011:0> obj.attr[:happy] = :sad
=> :sad
irb(main):012:0> obj.attr
=> {:happy=>:sad}
irb(main):013:0> obj.attr[:happy]
=> :sad
irb(main):014:0>

This example used a hash because it's easy, buy could make @attr be any 
class that accepts the []= method, including a class of your own.
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