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Source Code

# File active_record/callbacks.rb, line 179
def self.included(base) #:nodoc:
  base.extend Observable

  [:create_or_update, :valid?, :create, :update, :destroy].each do |method|
    base.send :alias_method_chain, method, :callbacks
  end

  CALLBACKS.each do |method|
    base.class_eval "def self.\#{method}(*callbacks, &block)\ncallbacks << block if block_given?\nwrite_inheritable_array(\#{method.to_sym.inspect}, callbacks)\nend\n"
  end
end