From: Markus Hohenhaus <markush@...>
Date: 2007-05-10T04:23:57+09:00
Subject: using dynamic method calling with attr_writer methods

I'm a total Ruby newbie looking for help.

I'm writing an application where I need to dynamical assign object
variables via attr_writer object methods.

My code is something like this:

   class Test < ParentClass
       attr_reader :one, :two, :three
       attr_writer :one, :two, :three

       def initialize
          super
       end

   end
( I know I could use attr_accessor but for testing I'll stick to
attr_writer and _reader)

Now I try to call the 'Test' methods dynamical witch 'object.send' from
within my main application:

   [...]

   @methods = ['one', 'two', 'three']

   test = Test.new

   @methods.each { |a| test.send(a, 'foo') }

   [...]

This throws the error: ArgumentError: wrong number of Arguments (1 for
0)

As far as I understand, this is the correct behaviour. Because without
the second argument, the method call returns the value of the class
variable. So I believe, that this should work if i'll write all the
setter and getter methods myself (which I don't want to, because I'm
using a lot of variables).
 Are there any other methods I can use to dynamically call attr_writer
methods to assign values to the class variables or did I get something
wrong and made a mistake?

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