instance method `add_observer`

Ruby on Rails 3.1.12

Since v3.0.20 Last seen in v3.2.22.5

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add_observer(observer)

Add a new observer to the pool. The new observer needs to respond to ‘update’, otherwise it raises an ArgumentError exception.

Parameters

observer req

Source

# File activemodel/lib/active_model/observing.rb, line 65
      def add_observer(observer)
        unless observer.respond_to? :update
          raise ArgumentError, "observer needs to respond to `update'"
        end
        observer_instances << observer
      end

Defined in activemodel/lib/active_model/observing.rb line 65 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::Observing::ClassMethods

Signature

Parameters