2161b8745a
Instead of using a single `notify_observers` call for every callback type,
each observer now registers a unique callback for itself. Example:
before_save :_notify_user_observer_for_before_save
def _notify_user_observer_for_before_save
observer.update(:before_save, self)
end
Benefit: "before" callbacks halt when `observer.update` returns false.
This way, ActiveRecord observers can prevent records from saving.
[#4087 state:committed]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
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