From: Davi Barbosa <d.barbosa+ruby@...>
Date: 2008-11-07T05:44:07+09:00
Subject: Creating object from hash

I'm creating an object from a hash using this:

class Computer
  def initialize(hash)
    hash.each do |k,v|
      instance_variable_set("@#{k}", v)  ## create and initialize an
instance variable for this key/value pair
      instance_eval %Q{ class << self ; attr_reader #{k.intern.inspect}
; end }
    end
  end
end

This works fine except if I need to define a method with the same name
of a key (if I need an complicated getter/setter for example). So I
added a test to attr_reader line:
instance_eval %Q{ class << self ; attr_reader #{k.intern.inspect} ; end
} if !instance_eval %Q{defined? #{k}}

As an Object, some methods are defined (like "id"). So "pc =
Computer.new({'id' > 1})" does not create the reader for @id and "pc.id"
calls some unwanted method.

If I just add "attr_reader :id" everything works. Can I do it directly,
without adding attr_reader (or attr_accessor) every time that I get an
error?
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