search for: audit_changes

...;' and ''date_of_birth'' I would like the callback to do something only when the ''username'' or ''password'' changes or when the ''date_of_birth'' changes from nil to something real. For example, how would I write... before_save :audit_changes def audit_changes if old.username != new.username audit("The username has changed from #{old.username} to #{new.username}) end if old.password != new.password audit("The user has changed their password") end if old.date_of_birth == nil and new.date_of_birth != ni...