Moose has introspection capabilities. Your VehicleDealer can find out what attributes a class has (even before that class is instantiated). If you name your attributes so that they can be identified (i.e. all configuration attributes of class car have a prefix of 'config_') or if simply all attributes of class car are to be configured by VehicleDealer, you don't need any of the attributes in VehicleDealer nor any intermediate classes with attribute lists.

Even without introspection I would just have a class method in car and motorbike that just returns all the attributes it possesses. So that the information is kept in one place only.

In reply to Re^3: Builder design pattern with lots of parameters - trying to declutter design by jethro
in thread Builder design pattern with lots of parameters - trying to declutter design by tospo

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