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Add documentation for ActiveRecord::Observer.

The instructions about configuration covered only rails-specific usage.
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commit 848c1b4f47dd64ea2ca1d4547f1d8a74214335c4 1 parent 35edd18
@kytrinyx kytrinyx authored
Showing with 6 additions and 0 deletions.
  1. +6 −0 activerecord/lib/active_record/observer.rb
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6 activerecord/lib/active_record/observer.rb
@@ -74,6 +74,12 @@ module ActiveRecord
#
# Observers will not be invoked unless you define these in your application configuration.
#
+ # If you are using Active Record outside Rails, activate the observers explicitly in a configuration or
+ # environment file:
+ #
+ # ActiveRecord::Base.add_observer CommentObserver.instance
+ # ActiveRecord::Base.add_observer SignupObserver.instance
+ #
# == Loading
#
# Observers register themselves in the model class they observe, since it is the class that
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