updating a JSON array in AWS dynamoDB

Question

My document looks like this:

{
  \"data\": {
      \"eventId\": \"20161029125458-df-d\",
      \"name\": \"first\",
      \"purpose\": \"test\",
      \"loca         


        

Answer 1

you can store the index of list. while updating the list we can use them. For example ,

{


"data": {
      "eventId": "20161029125458-df-d",
      "name": "first",
      "purpose": "test",
      "location": "yokohama",
      "dateArray": [],
      "attendees": [
        {  
          "index":0,  
          "attendeeId": "2016102973634-df",
          "attendeeName": "lakshman",
          "personalizedDateSelection": {}
        },
        {
           "index":1,
          "attendeeId": "2016102973634-tyyu",
          "attendeeName": "diwaakar",
          "personalizedDateSelection": {}
        }
      ]
    }
}
const params = {
  TableName: "event",
  Key: {
    "eventId": eventId 
  },
  UpdateExpression: "SET attendees[attendee.index].attendeeName = :value",
  ExpressionAttributeValues: {
    ":value" : {"S":"karthik"}
  },
  ReturnValues: "ALL_NEW"
};


dynamo.update(params, (err, data) => {
  if (err) {
    return reject(err);
  }
  console.log(data.Attributes);
});