Promisify 不是函数

Question

我正在研究 lex，我正在尝试在使用 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，因此无需使用 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)
    }
}