From: Holden Glova <dsafari@...>
Date: 2002-05-04T20:22:19+09:00
Subject: Re: dynamically assigning instance variables

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On Sat, 04 May 2002 09:43, Berger, Daniel wrote:
> Hi all,
>
> Yep, still trying to unwrap my brain from Perl and re-wrap it in Ruby...
>
> Is there a way to dynamically assign instance variables?
>
> class SomeClass
>    def initialize(hash)
>       hash.each do |key,val|
>          @#{key} = val # Doesn't work
>       end
>    end
> end
>
> Is there a better way to do this?
>
> Thanks in advance.
>
> Regards,
>
> Dan

I'll add something to pile, here is something I used as a mixin where ever i 
needed to this.

#
# Builds object attributes from a supplied Hash
#
module HashAttrBuilder

  #
  # Builds the object attributes from the supplied Hash.
  #
  # attributes: A Hash with each key being a Symbol
  #
  def build_instance_vars(attributes)
    attributes.each do |k, v|
      name = k.id2name
      value = v.type == String ? "'" + v + "'" : v
      instance_eval(<<-EOS)
        class << self
          attr_accessor :#{name}
        end
      EOS

      send("#{name}=", v)
    end
  end

end

- -- 
Signed,
Holden Glova
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