From: Sharon Phillips <phillipsds@...>
Date: 2007-03-10T18:36:17+09:00
Subject: Re: OpenStruct,, know what keys are set

On 10/03/2007, at 7:29 PM, Aaron Smith wrote:

> I need to use an OpenStruct to mimic what an object acts like in  
> another
> language. is it possible somehow to find what keys are set on an
> OpenStruct at any given time?

Disclaimer: I'm fairly new to this, so there's a reasonable chance  
I'm wrong to some degree.

Internally, OpenStruct stores the keys as symbols in a hash in an  
array @table which can be accessed via marshal_dump.

Alternatively, you may like to add a method like keys_added:

require 'ostruct'

class OpenStruct
	def keys_added
		@table.keys.map{|k| k.to_s}
	end
end

person= OpenStruct.new
person.name= "Fred"
person.age= 100

person.keys_added
=> ["age", "name"]