NodeJS 无法从请求正文读取“amount”的属性

dgtucam1  于 2022-11-29  发布在  Node.js
关注(0)|答案(3)|浏览(165)

我正在使用AWS在Nodejs中构建REST API。我期待着Postman的回应,说“

Your Bid Must Be Higher than ${auction.highestBid.amount}

“但是,我在Postman上收到了内部服务器错误,AWS Cloudwatch上的错误如下所示:enter image description here。但是,我在Postman上发送请求,地址为:enter image description here请帮助!!
我期待的回应是:你的出价必须高于

${auction.highestBid.amount}

修补程序请求主体如下所示:enter image description here创建请求如下所示:enter image description here
//placeBid.js

const AWS = require('aws-sdk');
const createError = require('http-errors');
const {getAuctionById} = require('./getAuction');

const dynamodb = new AWS.DynamoDB.DocumentClient();
async function placeBid(req) {

  const { id } = req.pathParameters;
  const { amount } = JSON.parse(req.body);
  const auction = getAuctionById(id);
  if(amount <= auction.highestBid.amount)
  throw new createError.Forbidden(`Your Bid Must Be Higher than ${auction.highestBid.amount}`);

  const params = {
    TableName: 'AuctionsTable',
    Key : {id},
    UpdateExpression : 'set highestBid.amount = :amount',
    ExpressionAttributeValues: {
      ':amount' : amount
    },
    ReturnValues : 'ALL_NEW'
  }

  let updatedAuction;
  try {
    const result = await dynamodb.update(params).promise();
    updatedAuction = result.Attributes;
  } catch (error) {
    console.error(error);
    throw new createError.InternalServerError(error);
  }

  return{
    statusCode : 200,
    body : JSON.stringify(updatedAuction)
  }
}

module.exports.handler = placeBid;

//getAuction.js

const AWS = require('aws-sdk');
    const createError = require('http-errors');
    
    const dynamodb = new AWS.DynamoDB.DocumentClient();
    
    module.exports.getAuctionById = async(id) => {
      let auction;
      try {
        const result = await dynamodb.get({
          TableName : 'AuctionsTable',
          Key : {id}
        }).promise()
        auction = result.Item;
    
      } catch (error) {
        console.error(error);
        throw new createError.InternalServerError(error);
      }
      if(!auction){
        throw new createError.NotFound(`Auction with ID ${id} not found`);
      }
      return auction;
    }
    
    async function getAuction(req) {
      const { id } = req.pathParameters;
      const auction = await getAuctionById(id);
      return{
        statusCode : 200,
        body : JSON.stringify(auction)
      }
    }
    
    module.exports.handler = getAuction
jhiyze9q

jhiyze9q1#

你抛出了一个错误而没有捕捉到它throw new createError.Forbidden(Your Bid Must Be Higher than ${auction.highestBid.amount});,所以你的Lambda崩溃并返回500个错误,这是预期的行为。
只需返回有效响应即可

return {
    statusCode : 400,
    body : `Your Bid Must Be Higher than ${auction.highestBid.amount}`
  }
x6492ojm

x6492ojm2#

如果您想查看使用AWS SDK for JavaScript(v3)编写REST API的示例,该示例可以调用AWS服务并返回数据,请参阅AWS代码目录中的此示例。成功构建REST API后,您可以使用Postman发送请求并查看响应。
此示例执行以下任务:

  • 将React.js Web应用与AWS服务集成。React应用使用Rest API(您也可以使用Postman查看响应)
  • 列出、添加和更新Aurora表中的项目。
  • 使用Amazon SES发送已筛选工作项的电子邮件报告。
  • 使用随附的AWS CloudFormation脚本部署和管理示例资源。

https://docs.aws.amazon.com/code-library/latest/ug/aurora_example_cross_RDSDataTracker_section.html

jexiocij

jexiocij3#

getAuctionByIdasync。它会传回Promise。您必须先await才能使用它的值:

const auction = await getAuctionById(id);

相关问题