Aws-sdk-js: AWS SDK put is returning empty for DynamoDB

[westlakem]

Following the guide posted here: https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#put-property

I am trying to put an object into my table.

UserService.ts

addUser(firstName: String, lastName: String) {
    let params = {
        TableName: 'MY_USERS_TABLE',
        Item: {
            id: uuid(),
            firstName: firstName,
            lastName: lastName
        }

    }

    return Observable.fromPromise(database.put(params).promise())
}

Then in my component.ts

this.userService.addUser(this.firstName, this.lastName).subscribe((person) => {
    console.log(JSON.stringify(person)
    console.log(JSON.stringify(person.$response.data))
    console.log(JSON.stringify(person.Attributes)
})

The output is:

JS: {}
JS: {}
JS: Undefined

What I'm trying to do is get back the data from the response of the call to the "PUT" function (EX: The data inserted from "ITEM" in the service)

MORE INFORMATION:

My IDE is telling me this is the (person) object that is passed into the subscribe function:

(parameter) person: DocumentClient.PutItemOutput & {
$response: Response<DocumentClient.PutItemOutput, AWSError>;}

[jeskew]

Hi @westlakem,

By default, DynamoDB::PutItem (and, by extension, the DocumentClient's put method) returns no data. You must specify a ReturnValues parameter on the input to direct DynamoDB to return any attributes, and consumed capacity will only be returned if a ReturnConsumedCapacity parameter is included in the input. For example, if you wanted put to return the updated user record, UserService.ts would need to be updated to:

addUser(firstName: string, lastName: string) {
    let params = {
        TableName: 'MY_USERS_TABLE',
        Item: {
            id: uuid(),
            firstName: firstName,
            lastName: lastName
        },
        ReturnValues: 'ALL_OLD',
    }

    return Observable.fromPromise(database.put(params).promise())
}

Please refer to https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html#putItem-property for more ReturnValues options.

[SheriefBadran]

@jeskew when I tried what you suggest I get the following error message:
ReturnValues can only be ALL_OLD or NONE

[PrasaViatick]

getting same error. Is there any solution available?

[azarboon]

@jeskew when I tried what you suggest I get the following error message:
ReturnValues can only be ALL_OLD or NONE

Same issue. This is strange and confusing that Dynamodb PUT operation doesn't return any value.

[normanhuang]

I'm actually still having an issue with the DocumentClient Put method. With the ReturnValues set to ALL_OLD or NONE, the object returned is still empty.

[srchase]

@normanhuang

Can you provide an example of your code?

[onurburak9]

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

[normanhuang]

@normanhuang

Can you provide an example of your code?

@srchase Yes, see below:

var dynamodb = new AWS.DynamoDB.DocumentClient();

let params = {
    TableName: 'Campaigns',
    Item: {
        CampaignId: uuid.v4(),
        name: 'Fubar'
    },
   ReturnValues: 'ALL_OLD'
};

dynamodb.put(params, (err, data) => {
    if (err) {
        console.error('Error: ', JSON.stringify(err, null, 2));
    } else {
        console.log('Successfully retrieved item:', JSON.stringify(data));
    }
});

[normanhuang]

Apologies. I figured it out. I was adding new items, for which the PutItem method and, by extension, the DocumentClient Put method returns empty because there were no older items to return. I tried replacing an existing item and the old item was returned.

[lock[bot]]

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