From: Florian Frank <flori@...>
Date: 2002-12-17T19:43:15+09:00
Subject: Re: standard accessor for List attribute

On 2002-12-17 18:25:24 +0900, Det wrote:
> Is there a way to do something like:
> 
> class MyClass
>       attrList_accessor :aRelation
> end
> 
> to get the above ?
> 
> Or is thought about putting something like that
> into future versions of Ruby ?

You could extend Ruby like that:

class Class

	def attr_list_accessor(*symbols)
		symbols.each do |s|
			class_eval <<-EOS
				def add_#{s}(elm)
					(@#{s} ||= []) << elm
				end

				def each_#{s}(&block)
					(@#{s} ||= []).each(&block)
				end
			EOS
		end
	end

end

class Test

	attr_list_accessor :foo, :bar

end

t = Test.new
t.add_foo "foo"
t.add_bar "bar"
t.add_bar "baz"
puts "Foo:"
t.each_foo { |e| puts e }
puts "Bar:"
t.each_bar { |e| puts e }

-- 
6) "Debugging? Klingons do not debug. Our software does not coddle the 
weak."
  -- "Top 12 things likely to be overheard if you had a Klingon Programmer"