title: rails format positive and negative numbers
body: <p>I'm trying to format a column of numbers in rails - using <code>number_to_currency</code>.  I want to display negative numbers with ()s - which is easy to do using the <code>negative_format</code> option.  However, when I do this, the decimal points in a column of numbers doesn't line up.  I want to add a trailing space to the format for positive numbers - <code>%u%n</code>, only I don't know how to do that - can anyone give me the right way to format in a trailing space?</p>
  
  <p><img src="https://i.stack.imgur.com/IEbf3.png" alt="enter image description here"></p>