Promisify不是一个函数

Question

我正在研究lex，并且正在尝试使用NodeJS时将用户数据存储在DynamoDB中

这是我的代码：

'use strict';

const uuidV1 = require('uuid/v1');
const AWS = require('aws-sdk');
const promisify = require('es6-promisify');
const dynamo = new AWS.DynamoDB.DocumentClient();

module.exports.saveBookingToDatabase = function(Arrival_city, Departure_city, Flight_type, Phone_number){
    console.log('saveBookingToDatabase');

    const item = {};
    item.bookingId = uuidV1();
    item.arrivalCity = Arrival_city;
    item.departureCity = Departure_city;
    item.classType = Flight_type;
    item.phone = Phone_number;

    const params = {
        TableName: 'airstallion',
        Item: item
    };



  const putAsync = promisify(dynamo.put, dynamo);

  return putAsync(params).then(() => {
      console.log(`Saving ticket ${JSON.stringify(item)}`);
      return item;
    })
    .catch(error => {
      Promise.reject(error);
    });
  }

当我运行程序时，返回以下error

Answer 1

由于aws-sdk库支持promise，因此不必使用es6-promisify库。使用node.js async/await，我们将实现相同的用例。

'use strict';

const uuidV1 = require('uuid/v1');
const AWS = require('aws-sdk');
const dynamo = new AWS.DynamoDB.DocumentClient();

module.exports.saveBookingToDatabase = async function(Arrival_city, Departure_city, Flight_type, Phone_number){
    console.log('saveBookingToDatabase');

    const item = {};
    item.bookingId = uuidV1();
    item.arrivalCity = Arrival_city;
    item.departureCity = Departure_city;
    item.classType = Flight_type;
    item.phone = Phone_number;

    const params = {
        TableName: 'airstallion',
        Item: item
    };

    try {
        let result = await dynamo.put(params)
        console.log(`Saving ticket ${JSON.stringify(item)}`);
    return item;  
    } catch(e) {
        throw (e)
    }
}