:attr_accessible to protect all attributes

Hi,

I would like to protect all the attributes of one of my model. This ticket talks about this issue: http://dev.rubyonrails.org/ticket/9631 , and a patch to the documentation was submitted: http://dev.rubyonrails.org/changeset/8032 , which actually states that defining :attr_accessible alone, means all attributes are protected.

However when I look at the rails API page for attr_accessible, I can't find the documentation about that:

As of Rails 2.2.2, how do I protect all attributes of my model?

Best regards,