If you ever need to use the acts_as_list gem in Rails on a model that uses single table inheritance, here’s the snippet you need to use for the list methods to work if you want the setup done on the base model:

acts_as_list :scope => [:type]

You’ll need to use the array syntax as neither the string nor the symbol versions will work. The symbol one assumes the column ending in _id, while the string one will simply not allow you to evaluate the current object’s type.

It’d be nice to have a lambda syntax in future versions of the gem so you can inject code into the conditions.