在Meteor javascript中检索Cloudinary图像作为文件对象

Question

我想通过public_id（currentPostId）从cloudinary获取图像文件

var currentPostId = this._id;
var file = $('#userimage')[0].files[0];
    if ("undefined" === typeof file) {
      var photo = cloudinary.image(currentPostId+".jpg");
      Cloudinary.upload(photo, {public_id: postProperties._id}, function(err, res) {
        console.log("Upload Error: " + err);
        console.log("Upload Result: " + res);
      });


    }

但是我收到以下错误消息：

app.js:372 Uncaught TypeError: cloudinary.image is not a function
    at Object.submit form (app.js:372)
    at blaze.js:3775
    at Function.Template._withTemplateInstanceFunc (blaze.js:3744)
    at Blaze.View.<anonymous> (blaze.js:3774)
    at blaze.js:2617
    at Object.Blaze._withCurrentView (blaze.js:2271)
    at Blaze._DOMRange.<anonymous> (blaze.js:2616)
    at HTMLFormElement.<anonymous> (blaze.js:863)
    at HTMLDivElement.dispatch (jquery.js:4722)
    at HTMLDivElement.elemData.handle (jquery.js:4390)

我可以尝试这样做，但我怎么能得到照片的网址？：

var photo = New File('url');