method_missing

# File activesupport/lib/active_support/option_merger.rb, line 16
      def method_missing(method, *arguments, &block)
        if arguments.first.is_a?(Proc)
          proc = arguments.pop
          arguments << lambda { |*args| @options.deep_merge(proc.call(*args)) }
        else
          arguments << (arguments.last.respond_to?(:to_hash) ? @options.deep_merge(arguments.pop) : @options.dup)
        end

        @context.__send__(method, *arguments, &block)
      end