Hello,
I try to use the new feature: derived slot. Everything is fine, except
an error is raised when try to drop the instance.
It is raised by following code:
(defmethod slot-makunbound-using-class ((class persistent-metaclass)
(instance persistent-object) (slot-def derived-index-slot-definition))
"Unbinding cannot be performed explicitly. It is effectively
inhibited when the derived fn says 'no'"
(error "Cannot unbind derived slot values for ~A in class ~A"
(slot-definition-name slot-def) (class-name class)))
I want to know the suitable way to delete the instance using derived
slot.
If I change above method to what indexed-slot-definition does, no error
is reported.
Thanks
Quan
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