method_missing

# File activesupport/lib/active_support/option_merger.rb, line 17
      def method_missing(method, *arguments, &block)
        options = nil
        if arguments.first.is_a?(Proc)
          proc = arguments.pop
          arguments << lambda { |*args| @options.deep_merge(proc.call(*args)) }
        elsif arguments.last.respond_to?(:to_hash)
          options = @options.deep_merge(arguments.pop)
        else
          options = @options
        end

        invoke_method(method, arguments, options, &block)
      end