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rails--rails/activemodel/CHANGES

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Changes from extracting bits to ActiveModel
* 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