dynamodb.put().promise()不返回放置对象

问题描述

我正在尝试使用有关aws和dynamo db的async/await功能.以下是如何在asyn await之前放置对象的示例，如您在回调中看到的那样，您可以访问包含put对象的数据.但是，在第二个使用异步并保证结果为空对象的代码块中，有什么想法吗?

I am trying to make use of the async/await functionality with regard to aws and dynamo db. Below is an example of how to put an object pre asyn await, as you can see in the callback you have access to data which contains the put object. However in the second block of code which uses async and promise the result is an empty object, any thoughts?

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GettingStarted.NodeJs.03.html

非承诺版本

var docClient = new AWS.DynamoDB.DocumentClient();

var table = "Movies";

var year = 2015;
var title = "The Big New Movie";

var params = {
    TableName:table,
    Item:{
        "year": year,
        "title": title,
        "info":{
            "plot": "Nothing happens at all.",
            "rating": 0
        }
    }
};

console.log("Adding a new item...");
docClient.put(params, function(err, data) {
    if (err) {
        console.error("Unable to add item. Error JSON:", JSON.stringify(err, null, 2));
    } else {
        console.log("Added item:", JSON.stringify(data, null, 2));
    }
});

承诺异步版本-假定包装功能已标记为异步

var docClient = new AWS.DynamoDB.DocumentClient();

var table = "Movies";

var year = 2015;
var title = "The Big New Movie";

var params = {
    TableName:table,
    Item:{
        "year": year,
        "title": title,
        "info":{
            "plot": "Nothing happens at all.",
            "rating": 0
        }
    }
};
const result: any = await dynamoDb.put(params).promise()
console.log(result)

推荐答案

根据文档，如果您想返回某些内容，则必须使用 ReturnValues .

According to the doc you have to use ReturnValues if you want something back.

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