# File lib/state_machine/integrations/active_model.rb, line 399
        def add_default_callbacks
          if supports_observers?
            callbacks[:before] << Callback.new(:before) {|object, transition| notify(:before, object, transition)}
            callbacks[:after] << Callback.new(:after) {|object, transition| notify(:after, object, transition)}
            callbacks[:failure] << Callback.new(:failure) {|object, transition| notify(:after_failure_to, object, transition)}
          end
        end