'end' 在 Iron Router for Meteor 中 this.response 未定义

Question

我已经使用 Iron Router 为我的 Meteor 服务器创建了一个 HTTP POST 端点。我想用 JSON 状态和一些其他元数据将响应发送回请求者。

这是端点的代码：

Router.route('/new_video', {where: 'server'})
.post(function(){

    var body = this.request.body;
    this.response.setHeader('Content-Type', 'application/json');

    var filename = body.filename;


    console.log('New video uploaded for: ' + filename);

    Meteor.call('newUpload', filename, function(error, results){
        if (error){
            throw new Meteor.Error("new-video-upload-failed", "New video could not be uploaded.");
            var message = {
                url: '/new_video',
                status: 'success'
            };
        }
        else{
            var videoId = results;
            console.log('Returned video id: ' + videoId);
            var message = {
                url: '/new_video',
                status: 'failure'
            };
        }

        this.response.end(JSON.stringify(message));
    });
});

Meteor 控制台正在打印：

=> Meteor server restarted
I20151002-15:51:26.311(-4)? New recording for: 1422776235,43.46756387,-80.54130886.mp4
I20151002-15:51:26.515(-4)? Returned video id: QiHXxZSb2sn9aNRPs
I20151002-15:51:26.569(-4)? Exception in delivering result of invoking 'newRecording': TypeError: Cannot call method 'end' of undefined
I20151002-15:51:26.569(-4)?     at shared/routes.js:79:17

Answer 1

由于在Meteor.call.

中引入了另一个函数回调而修改了this的值，这是JS的一个常见陷阱

如果您使用的是带有 ES2015 箭头函数的 Meteor 1.2，您可以改用此函数声明语法来解决问题：

Meteor.call('newUpload', filename, (error, results) => {
  // here 'this' will keep referencing the POST route context
  // so you can safely use this.response
});

如果您不使用 Meteor 1.2，请改用此语法：

Meteor.call('newUpload', filename, function(error, results) {
  // inner function is bound to parent function 'this'
}.bind(this));

'end' 在 Iron Router for Meteor 中 this.response 未定义

'end' undefined for this.response in Iron Router for Meteor

meteor

iron-router