From: Nicholas Clare <nickclare@...>
Date: 2007-05-10T04:34:29+09:00
Subject: Re: using dynamic method calling with attr_writer methods

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On 5/9/07, Markus Hohenhaus <markush@hni.upb.de> wrote:
>
> 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?
>
> --
> Posted via http://www.ruby-forum.com/.
>
>
I'm pretty new to ruby too, but from what I understand, the writer methods
will be called one=, two=, etc

So changing that @methods array to include the equals should fix your
problem

Hope this helps,
Nick

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