title: How can I determine the MD5 digest of a given asset in the Rails asset pipeline?
body: <p>I'm writing a Javascript-rich application in a Ruby on Rails 3.1 project and using Handlebars for my JS templating framework. I'm trying to figure out a way to dynamically append the MD5 digest of an asset (generated during asset precompilation on production) to my  tags inside of my Handlebars template. I'm hoping that there's a hash with the asset path as the key and the MD5 digest as the value, but I haven't been able to find one.</p>
  
  <p>An ideal solution would be passing the hash from Ruby into Javascript and defining a Handlebars helper that would automatically append the MD5 digest to the "src" attribute of the asset.</p>
  
  <p>Has anybody attempted to do something similar? There must be a way to use Javascript templates in Rails and also reap the benefits of asset fingerprinting. </p>