Promise resolve是一个空对象而不是用户数据

Question

我试图用这个承诺从数据库发回用户数据，但它最终发送一个空对象的任何想法为什么？我在想它是因为屈服关键不存在。但是当我添加yield键时会抛出错误

The keyword 'yield' is reserved var user = yield User.findBy('key', key);

代码：

LookupHelper.js

'use strict';
const User = use('App/Model/User');
class LookupHelper {
  // Looks up a user based on the key parameter and responds with the user object.
  static *searchAccountKey(key) {
      return new Promise((resolve,reject) => {
        var user = yield User.findBy('key', key);
        if (!user) {
          reject({
            status:'Not Found',
            message: 'Unable to find the user with that key please try the email'
          })
        } else {
            resolve(user);
        }
      });
  }

}

module.exports = LookupHelper;

UsersController.js查找方法

  * lookup(req, res) {
    const account = req.params('account');
    if (Validation.isNaN(account.account)) {
      Lookup.searchAccountKey(account.account).then(function(user) {
        console.log(user);
      }).catch(function(err){
        console.log("ERROR")
      });
    } else {
      // Email lookup alternative
    }
  }