Module: ActiveSupport::Callbacks

### Home Classes Methods

### In Files

- lib/active_support/callbacks.rb

### Namespace

- MODULE ActiveSupport::Callbacks::ClassMethods
- CLASS ActiveSupport::Callbacks::Callback
- CLASS ActiveSupport::Callbacks::CallbackChain

### Methods

- #callback
- #run_callbacks

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No matching classes.

# ActiveSupport::Callbacks

Callbacks are hooks into the life cycle of an object that allow you to trigger logic before or after an alteration of the object state.

Mixing in this module allows you to define callbacks in your class.

Example:

    class Storage
      include ActiveSupport::Callbacks

      define_callbacks :save
    end

    class ConfigStorage < Storage
      set_callback :save, :before, :saving_message
      def saving_message
        puts "saving..."
      end

      set_callback :save, :after do |object|
        puts "saved"
      end

      def save
        run_callbacks :save do
          puts "- save"
        end
      end
    end

    config = ConfigStorage.new
    config.save

Output:

    saving...
    - save
    saved

Callbacks from parent classes are inherited.

Example:

    class Storage
      include ActiveSupport::Callbacks

      define_callbacks :save

      set_callback :save, :before, :prepare
      def prepare
        puts "preparing save"
      end
    end

    class ConfigStorage < Storage
      set_callback :save, :before, :saving_message
      def saving_message
        puts "saving..."
      end

      set_callback :save, :after do |object|
        puts "saved"
      end

      def save
        run_callbacks :save do
          puts "- save"
        end
      end
    end

    config = ConfigStorage.new
    config.save

Output:

    preparing save
    saving...
    - save
    saved

### Public Instance Methods

callback(kind) click to toggle source

    # File lib/active_support/callbacks.rb, line 96
    def callback(kind)
      ActiveSupport::Deprecation.warn("callback is deprecated. Please use run_callbacks")
      send("_run_#{kind}_callbacks")
    end

run_callbacks(kind, *args, &block) click to toggle source

    # File lib/active_support/callbacks.rb, line 92
    def run_callbacks(kind, *args, &block)
      send("_run_#{kind}_callbacks", *args, &block)
    end

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