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*Rails 3.0.2 (November 15, 2010)** No changes*Rails 3.0.1 (October 15, 2010)** No changes*Rails 3.0.0 (August 29, 2010)** Added ActiveModel::MassAssignmentSecurity [Eric Chapweske, Josh Kalderimis]* JSON supports a custom root option: to_json(:root => 'custom') #4515 [Jatinder Singh]* #new_record? and #destroyed? were removed from ActiveModel::Lint. Use persisted? instead. A model is persisted if it's not a new_record? and it was not destroyed? [MG]* Added validations reflection in ActiveModel::Validations [JV] Model.validators Model.validators_on(:field)* #to_key was added to ActiveModel::Lint so we can generate DOM IDs for AMo objects with composite keys [MG]* ActiveModel::Observer#add_observer! It has a custom hook to define after_find that should really be in a ActiveRecord::Observer subclass: def add_observer!(klass) klass.add_observer(self) klass.class_eval 'def after_find() end' unless klass.respond_to?(:after_find) end* Change the ActiveModel::Base.include_root_in_json default to true for Rails 3 [DHH]* Add validates_format_of :without => /regexp/ option. #430 [Elliot Winkler, Peer Allan] Example : validates_format_of :subdomain, :without => /www|admin|mail/* Introduce validates_with to encapsulate attribute validations in a class. #2630 [Jeff Dean]* Extracted from Active Record and Active Resource.