aws lambda - Confused on creating an update request for DynamoDB using API Gateway -

i'm writing lambda function resources posting phone number. below code.

exports.handle = function (e, ctx, cb) {     var body = json.parse(e.body);     var params = {         tablename: 'useraddresses',         filterexpression: '#phone = :phone',         expressionattributenames: {             "#phone": "phone"         },         expressionattributevalues: {             ":phone": body.phone         }     }     dynamodb.scan(params).promise().then(function (data) {         var uw = data.items[0];         var res = {             "statuscode": 200,             "headers": {},             "body": json.stringify(uw)         };         ctx.succeed(res);     }); } 

this working fine. want same put , patch. can 1 please point me in right direction.

for patch, should like, phone should passed queryparameter , body updated in json body

thanks

is phone number hash key? if so, use dynamodb.get() or dynamodb.query() instead...

here's quick , dirty example, may started dynamodb updates:

const aws      = require('aws-sdk); const bluebird = require('bluebird');  aws.config.setpromisesdependency(bluebird);  const dynamodb = new aws.dynamodb.documentclient();  let update = (id, attributes) => {   var params = {     tablename: 'mytablename',     key: {       myhashkeyattr: id     },     attributeupdates: attributes   };    return dynamodb.update(params).promise(); };  exports.handler = (event, context, callback) => {   console.log(json.stringify(event, null, 2));   let body = json.parse(event.body);    let attributes = {     firstname: {       action: 'put',       value: body.firstname     },     lastname: {       action: 'put',       value: body.lastname     },     updatedat: {       action: 'put',       value: new date()     }   };     // if phone number hash key...   update(event.querystringparameters.phone, attributes)     .then(        (result) => {         console.log(result);         callback({           statuscode: 200,           headers: {},           body: json.stringify({message: 'updated!'})         });       }      ).catch(        (error) => {         console.error(error);         callback({           statuscode: 500,           headers: {},           body: json.stringify({message: 'ops!'})         });       }      ); } 

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