How to return the inserted item in dynamoDB

Question

I am using nodeJS sdk to put the item to dynamoDB, The item is:

{    "eventId": date + '-' + eventName + '-' + eventPurpose,    "eventName": eventName,    "eventPurpose": eventPurpose,    "eventDates": eventDates,    "attendees": attendees  } 

The present code for the putting the item in dynamoDB:

  const params = {     TableName: "event",     Item: {         "eventId": date + '-' + eventName + '-' + eventPurpose,         "eventName": eventName,         "eventPurpose": eventPurpose,         "eventDates": eventDates,         "attendees": attendees     },     ReturnValues: "ALL_OLD"   };    dynamo.put(params, (err, data) => {     console.log("coming here");     if (err) {       console.log("error : " + JSON.stringify(err));     }     console.log("data" + JSON.stringify(data));     cb(null, data);   }); 

The insertion happens correctly and the return value is an empty object.

I would like to return the inserted item. I found this doc. But this returns only in case of updating the old value. I could not find any other useful info other than this.

Is there any work around or we simply need to query using get method with the primary key?

Answer 1

The link you posted is, sadly, the only real answer at this time (API Version 2012-08-10). PutItem may return items just before they were updated or none at all.

The ReturnValues parameter is used by several DynamoDB operations; however, PutItem does not recognize any values other than NONE or ALL_OLD.

In short, the only reliable way to retrieve your inserted object is to GetItem, just as you surmised.

Answer 2

Just pass the params.Item in the callback :

 dynamo.put(params, (err, data) => {         if (err) {           cb(err);         }         cb(null, params.Item);       }); 

Pass the err in the callback too ;)