Unexpected behavior with AWS DynamoDB ScanInput ExpressionAttributeValue

I crafted a scan query to only retrieve enabled data in the following way:

    const FilterExpression = 'enabled = :enabled';
    const ExpressionAttributeValues = { ':enabled': { 'BOOL': true } };
    const scanParameters: ScanInput = {
      TableName,
      ExclusiveStartKey: cursor ?? undefined,
      Limit: Number(filter.limit) ?? undefined,
      FilterExpression,
      ExpressionAttributeValues,
    };

However, this setup does not return any values. When I modify the ExpressionAttributeValue to

const ExpressionAttributeValues = { ':enabled': true };

it does return values but does not comply with the type of ScanInput. This triggers errors similar to this https://i.sstatic.net/uHPOP.png

"Type '{ ':enabled': boolean; }' is not assignable to type 'ExpressionAttributeValueMap'. Property '':enabled'' is incompatible with the index signature. " One potential solution is to create a new type and assign values accordingly, but why isn't the ScanInput data format working as expected during data scanning?

typescriptamazon-web-servicesamazon-dynamodbdynamodb-queries

Answer №1

Your provided code snippet lacks sufficient information for a complete understanding of your issue. From what I gather, it appears that there may be confusion regarding the use of clients. It seems like you are setting parameters for the low-level client using DynamoDB JSON syntax like { 'BOOL': true }, when in fact, you should be using the Document client which utilizes native JSON.

/*
  To resolve this, ensure that you convert the JavaScript object key you are retrieving into the correct Amazon DynamoDB record format. Different data types have specific formatting requirements, as outlined below:
  - String: "String",
  - NumAttribute: 1,
  - BoolAttribute: true,
  - ListAttribute: [1, "two", false],
  - MapAttribute: { foo: "bar" },
  - NullAttribute: null
   */

Make sure to verify that you are utilizing the appropriate syntax for the specific client you are working with.

Consider the following approach:

const params = {
  TableName: TableName,
  ExpressionAttributeNames: { "#enablee": "enabled"},
  FilterExpression: "#enabled = :enabled",
  ExpressionAttributeValues: {
    ":enabled": true
  },
};


const data = await ddbDocClient.send(new ScanCommand(params));

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