如何解决这不是一个功能nodejs

Question

I am following this article from medium https://blog.bitsrc.io/serverless-backend-using-aws-lambda-hands-on-guide-31806ceb735e

Everything works except when I attempt to add a record to the DynamoDB I get an error that say "this is not a function"

const AWS = require ("aws-sdk");

const client = new AWS.DynamoDB.DocumentClient();

const uuid = require ("uuid");

module.exports.myHero = async (event) => {

    const data = JSON.parse(event.body);

    const params = {

        TableName: "myHeros",
        Item: {

            id: uuid(),
            name: data.name,
            checked: false
        }
    };

    await client.put(params).promise();

    return {

        statusCode: 200,
        body: JSON.stringify(data)
    };
};

{
    "errorMessage": "client.put(...).promise is not a function",
    "errorType": "TypeError",
    "stackTrace": [
        "module.exports.myHero (/var/task/create.js:30:27)"
    ]
}

Answer 1

在初始化dynamodb客户端新的AWS.DynamoDB.DocumentClient（）时，请将选项（至少是区域参数）传递给DocumentClient函数。

Answer 2

In almost all cases, when you call a method xyz() on an AWS client object and it fails with 'xyz is not a function', the problem is that you are using an old version of an SDK that does not actually support that method.

Upgrading to the latest AWS SDK version will fix this problem.