Rails core - May 2007 - [PATCH] attr_private for hiding a database column, improves encapsulation

I''d like your feedback on a patch I submitted.  I''ve included
an
excerpt from it below.
http://dev.rubyonrails.org/ticket/8355

[PATCH] attr_private for hiding a database column, improves
encapsulation

This is a patch on ActiveRecord that creates ''attr_private''.
attr_private provides a way to make one or more database columns
appear to be private. This allows AR models to be better encapsulated,
meaning that they can hide their implementation details.

class NegotiatingAgent < ActiveRecord::Base
  attr_private :min_acceptable_price
end

r = NegotiatingAgent.new
r.min_acceptable_price  # => NoMethodError
r.min_acceptable_price = 350  # => NoMethodError
r[:min_acceptable_price]  # => PrivateAttributeError
r[:min_acceptable_price] = 250  # => PrivateAttributeError
r.attributes  # will not include :min_acceptable_price

More information on the motivating reasons (and other workarounds I
tried first) can be found in Trac:
http://dev.rubyonrails.org/ticket/8355

Thanks,
David James

P.S.  I''m at RailsConf, please say hi if you see me.


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