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"The observer pattern (aka. Dependents, publish/subscribe) is a software design pattern in which an object, called the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods."

" before_filter :set_current_user private def set_current_user User.current_user = #however you get the current user in your controllers end"

Simple, global ActiveRecord event observers, using a middleware architecture, that can easily be turned on and off. Designed for audit trails, activity feeds and other app-level event handlers