Getting Backbone to communicate with XML services using CoffeeScript

gistfile1.coffee

# Keep track of the original sync method so we can
# delegate to it at the end of our new sync.
originalSync = Backbone.sync

# Our new overriding sync with dataType and ContentType
# that override the default JSON configurations.
Backbone.sync = (method, model, options) ->

  options = _.extend(options,
    dataType: 'xml'
    contentType: 'application/xml'
    processData: false
  )

  originalSync.apply(Backbone, [ method, model, options ])