Passing Rails variable/data to Coffeescript/Javascript

My problem

I need to access data from rails controller - currently, in my view I do this view.erb

app.factory "preloadedInvoice", ->
  <%= raw @job_invoice.to_json %>.job_invoice;

and this will allow preloadedInvoice to bebe used on the coffee/js file:

class @JobInvoice
  constructor: (credentials, preloadedInvoice, $http) ->
    angular.extend(this, preloadedInvoice)

Having the JS on the view feels wrong - but in this case we need to, because the: a. we can't access rails variables on the coffee file b. we need to access raw helper to generate html escaped JSON (this is a lesser of an issue I guess - could just require action_view probably?)

Some discussion:

http://stackoverflow.com/questions/8513912/rails-access-controller-instance-variable-in-coffeescript-or-javascript-asset-f
http://railscasts.com/episodes/324-passing-data-to-javascript?view=asciicast

Gon gem makes it cleaner from the code point of view - but it is essentially doing similar thing to what my previous approach but just streamlining it a little bit by putting on the application view helper.

Will try that for now.

cemeng/gist:3830457

My problem