我正在尝试使用与Bluebird库的promises重构我的nodejs服务器,但我陷入了一个简单的问题.

从我的数据库中获取用户之后,我想列出与该用户关联的所有通知类:

坏路(工作......)

adapter.getUsers(function(users){
    users.rows.forEach(function(item){
        user = item.username;
        adapter.getNotifications(user, function(notificationList){
            console.log(notificationList);
        })
    });
});

优雅的暂定方式(不工作...)

var getNotifications = Promise.promisify(adapter.getNotifications);
adapter.getUsers().then(function(users) {
    users.rows.forEach(function(item){
        var dbUser = "sigalei/" + item.value.name;
        console.log(dbUser);
        return getNotifications(dbUser);
    });
}).then(function(result){
    console.log(result);
    console.log("NOTIFICATIONLIST");
});

但是,当我执行此代码时,我在getNotification方法中遇到此错误:

未处理的拒绝TypeError:无法在TryCatcher(/ Users/DaniloOliveira /)上的Adapter.getNotifications(/Users/DaniloOliveira/Workspace/sigalei-api/api/tools/couchdb-adapter.js:387:30)读取未定义的属性'nano'.工作区/ sigalei-API/node_modules /蓝鸟/ JS /主/ util.js中:26:23)

编辑

var Adapter = module.exports = function(config) {
    this.nano = require('nano')({
        url: url,
        request_defaults: config.request_defaults
    });
};

Adapter.prototype.getNotifications = function(userDb, done) {

    var that = this;
    console.log(that);
    var userDbInstance = that.nano.use(userDb);
    userDbInstance.view('_notificacao', 'lista',
      {start_key: …

我正在尝试使用NodeJS/express 4创建一个端点,该端点生成并向用户发送xlsx文件.

要创建xlsx文件,我正在使用该node-xlsx库.

var xlsx = require('node-xlsx');
var buffer = xlsx.build([{
  name: pasta,
  data: data
}]);
res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
res.setHeader("Content-Disposition", "attachment; filename=" + pasta + ".xlsx");
res.write(buffer, 'binary');
return res.end();

我试图通过Angular应用程序下载此文件.

$http.post('https://endpoint/v1/' + folderName + '/reportExcel', {
    responseType: 'arraybuffer'
  })
  .success(function(response) {
      var blob = new Blob([response], {
        type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
      });
      var objectUrl = URL.createObjectURL(blob);
      $window.open(objectUrl);

但是,正在下载的文件已损坏,因此无法打开它.