method

add_observer

Ruby on Rails latest stable (v6.1.7.7) - 0 notes - Class: ActiveModel::Observing::ClassMethods

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What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v3.2.13) is shown here.

add_observer(observer) public

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

Show 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

add_observer

Related methods

Method deprecated or moved

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