Promise对象在Javascript中工作，但在Coffeescript结果中没有传递给.then（）

Question

这个原始javascript有效：

   function newStatusEvent(account, eventId, url, deferred, iteration) {
        var iteration = typeof iteration !== 'undefined' ? iteration : 0;
        url.get()
        .then(function(data) {
            console.log(data);
            if (data.Automation.Status != "COMPLETED") {
                if (iteration < CHECK_ITERATIONS) {
                    iteration++;
                    $timeout(function (){
                        newStatusEvent(account, eventId, url,
                            deferred, iteration);
                    }, TIME_ITERATION);
                } else {
                    deferred.reject("failure");
                }
            } else {
                deferred.resolve("complete");
            }
        });
        return deferred.promise;
    }

---

但是在coffeescript中：

  newStatusEvent = (account, eventId, url, deferred, iteration) ->
    iteration = (if typeof iteration isnt "undefined" then iteration else 0)
    url.get().then (data) ->
      console.log(data)
      unless data.Automation.Status is "COMPLETED"
        if iteration < CHECK_ITERATIONS
          iteration++
          $timeout (->
            newStatusEvent account, eventId, url, deferred, iteration
            return
          ), TIME_ITERATION
        else
          deferred.reject "failure"
      else
        deferred.resolve "complete"
      return
    deferred.promise

data url.get().then (data) ->未定义。另外，coffeescript版本没有将承诺对象的结果... data传递给.then()方法。我想这是一个咖啡脚本的东西，因为它在javascript中工作。到底是怎么回事？