AWS DynamoDB Metadata

October 5, 2022

Is there a way to add custom metadata on DynamoDB when performing such operations as PutItem, Query, Scan, GetItem, etc.? Where I can add and read those metadata?

Example:

"sample-key": "sample-value"

I think the S3 has the Metadata field on its UploadInput. While the SQS has the MessageSystemAttributeValue.

>Solution :

This is not possible in DynamoDB like how you do it in S3 or SQS.

For DynamoDB, you simply need to add an attribute to the item when you put/update it, in this case I call the attribute metadata:

  Item={
            'pk': 'jose.schneller@somewhere.com',
            'sk': 'engineer',
            'username': 'joses',
            'first_name': 'Jose',
            'last_name': 'Schneller',
            'name': 'Jose Schneller',
            'age': 27,
            'address': {
                'road': '12341 Fish Rd',
                'city': 'Freeland',
                'pcode': 98249,
                'state': 'WA',
                'country': 'USA'
            }, 
            'metadata':{
                'sample-key': 'sample-value'
            }
}

This means you get the items metadata each time you read the item.