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*Rails 3.1.0 (unreleased)*

* attr_accessible and friends now accepts :as as option to specify a role [Josh Kalderimis]

* Add support for proc or lambda as an option for InclusionValidator,
  ExclusionValidator, and FormatValidator [Prem Sichanugrist]

  You can now supply Proc, lambda, or anything that respond to #call in those
  validations, and it will be called with current record as an argument.
  That given proc or lambda must returns an object which respond to #include? for
  InclusionValidator and ExclusionValidator, and returns a regular expression
  object for FormatValidator.

* Added ActiveModel::SecurePassword to encapsulate dead-simple password usage with BCrypt encryption and salting [DHH]

* ActiveModel::AttributeMethods allows attributes to be defined on demand [Alexander Uvarov]

* Add support for selectively enabling/disabling observers [Myron Marston]


*Rails 3.0.2 (unreleased)*

* No changes


*Rails 3.0.1 (October 15, 2010)*

* No Changes, just a version bump.


*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.