Rails moves fast, and it's very common to see out of date documentation. During my recent walk-through of Agile Web Development with Rails, 3rd edition, I encountered a problem where Rails 2.3.8 handles Session configuration differently from what the book describes.
That is normal with Rails. By the time documentation is written, and especially once things are in print, Rails has already moved on. Rails developers need to know this ahead of time and become comfortable with reading Release Notes, digging through the source, and checking various websites (Stack Overflow is a pretty helpful site for developers).
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