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instantiate_observer(observer) protected

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# File activemodel/lib/active_model/observing.rb, line 83
        def instantiate_observer(observer) #:nodoc:
          # string/symbol
          if observer.respond_to?(:to_sym)
            observer.to_s.camelize.constantize.instance
          elsif observer.respond_to?(:instance)
            observer.instance
          else
            raise ArgumentError,
              "#{observer} must be a lowercase, underscored class name (or an " +
              "instance of the class itself) responding to the instance " +
              "method. Example: Person.observers = :big_brother # calls " +
              "BigBrother.instance"
          end
        end
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