# File activerecord/lib/active_record/observer.rb, line 34
def instantiate_observers
return if @observers.blank?
@observers.each do |observer|
if observer.respond_to?(:to_sym) # Symbol or String
observer.to_s.camelize.constantize.instance
elsif observer.respond_to?(:instance)
observer.instance
else
raise ArgumentError, "#{observer} must be a lowercase, underscored class name (or an instance of the class itself) responding to the instance method. Example: Person.observers = :big_brother # calls BigBrother.instance"
end
end
end