From: Rahul Kumar <sentinel1879@...>
Date: 2010-09-12T22:49:26+09:00
Subject: creating trivial classes with Struct.new (adding constraints

I'd like to use this form for making small classes rather than hand
coding my  "beans".

ActionEvent = Struct.new(:source, :id, :text) do
   def xxx ... end
end

However, is there anyway I can add some constraints, such as:

 - source (some of the fields) must not be nil.
 - no changing values after creation, unless there's a method provided

Essentially, the fields should correspond to attr_reader and not
attr_accessor.
Have i lost the open purpose of this form in my requirement.

I was reading this article about it:
http://blog.grayproductions.net/articles/all_about_struct (Thx to JEG).
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