new

# File activemodel/lib/active_model/validations/acceptance.rb, line 27
        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