Override Backbone.sync

backbone-sync.js

define('mod/bbsync', [
  'underscore'
, 'mod/ajax'
], function(_, Ajax) {
  function sync(method, model, options) {
    var url = model.url, data

    url = _.isFunction(url) ? model.url() : url
    data = method === 'create' || method === 'update'
      ? model.toJSON() : {}

    method = Ajax.methodMap[method]
    return Ajax.request(method, url, data, options, 'json')
  }
  return sync
})