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== Welcome This is an experiment. Goal: A hierarchy of classes by inheritance whose attribute definitions can be defined by the user (vs. the coder). Given you have the base class named Product - it may have a name (and a price, but we don't care for this, right?). When you inherit Product with "Clothes" by creating a new Classification and add an AttributeDefinition (:size, :integer), then you can instanciate this class and rails uses its STI technique. But instead of creating a column for every (possible) attribute, the user can add more an more to it.