Javascript 使用node.js使用嵌套对象对dynamoDB进行条件更新

我试图更新数据库表中的3个嵌套项，我的lambda运行良好，没有任何错误，但是当查询表时，它没有显示新值，我不确定我是否调用表或正确传递参数

我的分区键/主键是badgeNumber

我的dynamoDB表如下所示： 我试图更新的项目有日期、小时、注册到yyy mm dd、hh mm ss和true

更新项目的条件是，如果register is=false，则将新值写入表中

我的代码如下所示 pppp

var UPDATEASISTANCE=函数日、小时、id{ var docClient=new AWS.DynamoDB.DocumentClient； 变量参数={ TableName:someTable， 密钥：{badgeNumber:0000}， UpdateExpression:SET asi[0]。reg=：locVal， 表达式属性名称：{ “asi”：“asisstance”， '注册'：'注册'， }, 条件表达式：NEasi[0]。reg:true， 表达式属性值：{ ：日期：日， ：小时：小时， ：locVal:true }, ReturnValues:UPDATED\u NEW }; docClient.updateparams，functionerr，data{ 如果出错{ console.logError，err； }否则{ console.logSuccess，数据； } }; }; 定义函数后，我使用

updateAssistance(day,hour,id)

预期输出应如下所示：

  "assistance": [
    {
      "date": "yyyy-MM-DD",
      "hour": "HH-MM-SS",
      "register": true
    }
  ],

---

我通过修改代码解决了这个问题，同时，我的条件表达式也错了……下面是它的样子

'use strict';
const AWS = require('aws-sdk');

var today = new Date();
var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
var hour = (today.getHours()-5) + ":" + today.getMinutes() + ":" + today.getSeconds();

exports.handler = async (event,context) => {

    const documentClient = new AWS.DynamoDB.DocumentClient();
    let responseBody = "";
    let statusCode = 0;

    var params = {
    TableName:"SomeTable",
    Key: { badgeNumber : '0000' },
    UpdateExpression: "set assistance[0].register = :n,assistencia[0].date = :date,assistencia[0].hour = :hour",
    ExpressionAttributeNames: {
      '#asi': 'assistance',
      '#reg': 'register'
    },
    ConditionExpression: "(#asi[0].#reg = :p)",
    ExpressionAttributeValues:{
        ":n":true,
        ":p":false,
        ":date":date,
        ":hour":hour
    },
    ReturnValues:"UPDATED_NEW"
    }


    try {
        const data = await documentClient.update(params).promise();
        responseBody = JSON.stringify(data);
        statusCode = 204;
    } catch (err) {
        responseBody = `Unable to update product: ${err}`;
        statusCode = 403;
    }    

    const response = {
        statusCode: statusCode,
        headers: {
            "Content-Type": "application/json"
        },
        body:responseBody
    }
    return response
}

这会改变dynamoDB表中的嵌套值，如果您没有这些值的话

'use strict';
const AWS = require('aws-sdk');

var today = new Date();
var date = today.getFullYear()+'-'+(today.getMonth()+1)+'-'+today.getDate();
var hour = (today.getHours()-5) + ":" + today.getMinutes() + ":" + today.getSeconds();

exports.handler = async (event,context) => {

    const documentClient = new AWS.DynamoDB.DocumentClient();
    let responseBody = "";
    let statusCode = 0;

    var params = {
    TableName:"SomeTable",
    Key: { badgeNumber : '0000' },
    UpdateExpression: "set assistance[0].register = :n,assistencia[0].date = :date,assistencia[0].hour = :hour",
    ExpressionAttributeNames: {
      '#asi': 'assistance',
      '#reg': 'register'
    },
    ConditionExpression: "(#asi[0].#reg = :p)",
    ExpressionAttributeValues:{
        ":n":true,
        ":p":false,
        ":date":date,
        ":hour":hour
    },
    ReturnValues:"UPDATED_NEW"
    }


    try {
        const data = await documentClient.update(params).promise();
        responseBody = JSON.stringify(data);
        statusCode = 204;
    } catch (err) {
        responseBody = `Unable to update product: ${err}`;
        statusCode = 403;
    }    

    const response = {
        statusCode: statusCode,
        headers: {
            "Content-Type": "application/json"
        },
        body:responseBody
    }
    return response
}