Changeset [2161b8745a22379356b466a60b9aa763c0593f9b] by Mislav Marohnić

improve how ActiveRecord::Observer defines callbacks on observed models

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
http://github.com/rails/rails/commit/2161b8745a22379356b466a60b9aa7...