title: How do I use rails ActionView::Helpers::NumberHelper in Sinatra?
body: <p>I want to use the Rails ActionView::Helpers::NumberHelper module in my Sinatra views. Specifically, I'd like to use <code>number_to_currency</code> though I would love to have additional Rails helpers. </p>
  
  <p>If there is a more appropriate gem for Sinatra that provides number to currency, that would work too. For example, I've looked through sinatra-more, but it doesn't handle currency.</p>
  
  <p>PS. I'm using Bundler.</p>