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@@ -7,7 +7,8 @@ module Stateful
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   class BadTransition < StandardError
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     def initialize(model, event)
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-      super("Can't #{event.name} while #{model.current_state}: #{model.inspect}")
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+      current = model.class.statefully.persister.state_of(model)
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+      super("Can't #{event.name} while #{current}: #{model.inspect}")
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     end
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   end
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@@ -27,7 +27,7 @@ module Stateful
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         unless target.method_defined?("#{name}?")
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           target.class_eval <<-RUBY
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             def #{name}?
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-              current_state == #{name.inspect}
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+              self.class.statefully.persister.state_of(self) == #{name.inspect}
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             end
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           RUBY
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         end
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@@ -49,7 +49,7 @@ module Stateful
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     def execute(model, name)
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       raise Stateful::BadModel.new(model) unless model.class.stateful?
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-      now   = model.current_state
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+      now   = persister.state_of(model)
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       event = events[name] or raise EventNotFound.new(name)
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       from  = states[now] or raise StateNotFound.new(now)
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       dest  = event.transitions[now] or raise BadTransition.new(model, event)

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@@ -4,6 +4,10 @@ module Stateful
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       def persist(model, state)
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         model.current_state = state
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       end
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+      
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+      def state_of(model)
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+        model.current_state
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+      end
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       def accessorize(target)
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         unless target.respond_to?(:current_state)

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@@ -1,11 +1,15 @@
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 module Stateful
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   module Persisters
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     class Default
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-      def accessorize(target) end
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-      
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       def persist(model, state)
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         raise "I don't know how to persist state changes. Sorry!"
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       end
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+      
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+      def state_of(model)
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+        raise "I don't know how to persist state changes. Sorry!"
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+      end
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+
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+      def accessorize(target) end      
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     end
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   end
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 end