Rails - Jul 2006 - acts_as_list with single table inheritance

I have a question about where to decorate my classes with acts_as_list.

I am using single table inheritance and i have a base class LookupItem.
There are 5 child classes: Priority, Probability, RiskRating, Status, and
RiskManagementItem.

Each of these 5 items needs to act as a list.  Should I use acts_as_list on
each child class or should it go on the parent LookupItem class?  I''m
guessing that it should go on the child classes, but I couldn''t find
anything concrete to point me in one direction or another.

Thanks,

jeremiah
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