> I need to do more reading on Exceptions, but my case seems more like a
> flash message than throwing an exception.
>
If you have your own custom exception NotEmptyCategoryException, you can
throw it from beforeDelete() and catch it in controller:
try {
$this->Category->delete($id);
} catch (NotEmptyCategoryException $e) {
$this->Session->setFlash('This category is not empty');
$this->redirect($this->referer());
}
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