From: Jim Freeze <jim@...>
Date: 2002-05-22T21:12:37+09:00
Subject: Re: Accessors how to create a new one ?

On Wed, May 22, 2002 at 08:59:42PM +0900, Henry Ghusakovsky wrote:
> Hi everybody,
> 
> Is there any possibility to create my own accessor like standard accessors
> 
Sure. Here is one that I did a while back:

class Module
  def attr_scale_reader(*attrs)
    attrs.each { |attr|
      class_eval %{
        def #{attr}_d
          @#{attr}/@scale
        end
      }
    }
  end#attr_scale_reader
end

This works a little different than the standard attr_reader,
in that it creates a function name that is different than
the attrs argument.

For your hash_reader, you could write

class Module
  def hash_reader(*attrs)
    attrs.each { |attr|
      class_eval %{
        def #{attr}
          @data['#{attr}']
        end
      }
    }
  end#hash_reader
end
# warning, code is not tested

I'm sure that you can create the writer and accessor
functions from this example.

Cheers
Jim

> sample
> 
> ...
> hash_accessor :attr1
> ...
> 
> should create methods
> 
> def attr1
>     return @data["attr1"]
> end
> 
> def attr1=(value)
>     @data["attr1"]=value
> end
> 
> is there any clue ?
> 
> Best regards,
> 
> Henry Ghusakovsky
> mail: H.Ghusakovsky(&)sam-solutions.net
> ICQ# 34523185
> 

-- 
Jim Freeze
If only I had something clever to say for my comment...
~