[ilikepi]

We implemented something like this on our own. We have child classes that inherit from an AR-backed parent, and on the parent we implement an instance method that transforms it (via #becomes) to the appropriate child based on the value of an attribute. The final piece is another attribute that stores a serialized object of child-specific attributes, and other methods that dynamically define attribute readers at boot time. It'll be nice to migrate to this new feature to free ourselves from the burden of that last piece in particular.