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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1141 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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1 parent 1cad24f commit ea803aa4e3088522855d3695166b6489a273382f @dhh dhh committed Apr 10, 2005
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  1. +5 −0 activerecord/lib/active_record/observer.rb
@@ -44,6 +44,11 @@ module ActiveRecord
# == Available callback methods
#
# The observer can implement callback methods for each of the methods described in the Callbacks module.
+ #
+ # == Triggering Observers
+ #
+ # In order to activate an observer, you need to call Observer.instance. In Rails, this can be done in controllers
+ # using the short-hand of for example observer :comment_observer.
class Observer
include Singleton

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