ActioinController::observer generates a deprecation warning in 1.2,
however there doesn’t seem to be a replacement.
I have a couple of cases where I have an observer (eg UserObserver)
that must be instantiated in order for the obserer to be called.
Removing the observer declaration at the beginning of the controller
eliminates the warning, but doesn’t result in the observer being
What is the right way to do this in 1.2?