From: Robert Klemme <bob.news@...>
Date: 2005-08-12T16:56:11+09:00
Subject: Re: Dynamically added methods

Yann Klis wrote:
> In fact, I'd like to mimic the behaviour of ActiveRecord.
> 
> If I have something like this:
> 
> class Base
> 
>   def initialize(attributes)
>     #do something clever with attributes
>   end
> 
> end
> 
> class MyObject < Base
> end
> 
> I'd like to be able to do that:
> 
> object = MyObject.new({"attribute1" => "value1", "attribute2" =>
> "value2"})
> val = object.attribute1

As others have pointed out already, use OpenStruct:

09:51:10 [robert.klemme]: irbs
>> require 'ostruct'
=> true
>> object = OpenStruct.new( "attribute1" => "value1", "attribute2" =>
?> "value2")
=> <OpenStruct attribute1="value1" attribute2="value2">
>> object.attribute1
=> "value1"
>> object.attribute2
=> "value2"

If you need inheritance, you can do

class MyObject < OpenStruct
end

That's it.

If you need additional initialization, you'll have to do

class MyObject < OpenStruct
  def initialize(attrs)
    super(attrs)
    # do more init
  end
end

Kind regards

    robert