[Rails] Protecting certain model attributes from being exposed in an API

In my current project, there are business and security requirements that prevent certain values from being exposed. I was looking for a way to specify which attributes in a model should be protected. This is what I've come up with and I would love feedback as to whether or not it's a valid solution and how I could improve it.

Basically, I'm following the attr_accessible style and defining an attr_private method for setting specific attributes (or methods) as private.

http://codereview.stackexchange.com/questions/16064/protecting-certain-model-attributes-from-being-exposed-in-an-api

Your thoughts are much appreciated. Thanks in advance.

Jeremy

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