new

# File activemodel/lib/active_model/validations/acceptance.rb, line 28
          def initialize(attribute_definition)
            define_method(:respond_to_missing?) do |method_name, include_private = false|
              super(method_name, include_private) || attribute_definition.matches?(method_name)
            end

            define_method(:method_missing) do |method_name, *args, &block|
              if attribute_definition.matches?(method_name)
                attribute_definition.define_on(self.class)
                send(method_name, *args, &block)
              else
                super(method_name, *args, &block)
              end
            end
          end