Failure to unmarshal string set data from DynamoDB

Question

Failure to unmarshal string set data from DynamoDB

I attempted to marshal a String Set from DynamoDB and then unmarshal it back as shown below.

import {marshall, unmarshall} from '@aws-sdk/util-dynamodb';

test('Marshall and Unmarshall Test', () => {
  const raw = {
    'anArray': new Set([
      'Apple',
      'Mango'
    ])
  };

  console.log(JSON.stringify(marshall(raw)));
  // {"anArray":{"SS":["Apple","Mango"]}}

  const marshalledResult = marshall(raw);

  console.log(JSON.stringify(unmarshall(marshalledResult)));
  // {"anArray":{}}

});

However, I am struggling to retrieve the String Set properly. What is the correct method for retrieving a String Set from DynamoDB and utilizing it?

javascript amazon-dynamodb unmarshalling

Answer 1

Answer №1

deserialize is the most appropriate method to use in this scenario. The reason you may not be getting the expected outcome could be due to the fact that JSON.stringify does not handle sets well. I suggest directly logging the deserialized result like so:

const deserialized = deserialize(serializedData)
console.log(deserialized);
// => { fruits: Set(2) { 'Apple', 'Mango' } }

Answer 2

deserialize is the most appropriate method to use in this scenario. The reason you may not be getting the expected outcome could be due to the fact that JSON.stringify does not handle sets well. I suggest directly logging the deserialized result like so:

const deserialized = deserialize(serializedData)
console.log(deserialized);
// => { fruits: Set(2) { 'Apple', 'Mango' } }

Failure to unmarshal string set data from DynamoDB

Answer №1

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