How to Query a Array of objects in DynamoDB using FilterExpression in scan operation

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How to Query array of objects(workingDays) key containing only "Tue" in dynamoDb with Scan Operation,I have queried using filter Expression but i am getting no results.

var queryData = {
        TableName: tableName,
        FilterExpression: "contains (workingDays, :dayVal)",
        ExpressionAttributeValues: {
            ":dayVal": {
                S:"Tue"
            }
        }
    };

    console.log("getParams ==>", queryData)
    dynamodb.scan(queryData, function (err, details) {
        if (err) {
            console.log(err, err.stack); // an error occurred
            callback(err, null)
        }
        else{
           callback(null, details)

        }
    })
dynamodb-queries amazon-dynamodb aws-lambda
1 Answers

ExpressionAttributeValues in your query contains String ["S"] as 'key' for value 'Tue', where as in your table, 'workingDays' is a list of map object containing value for day keys.

Try below code:

var queryData = {
    TableName: tableName,
    ExpressionAttributeNames: {
         "#workingDays": "workingDays",
    },
    FilterExpression: "contains (#workingDays, :dayVal)",
    ExpressionAttributeValues: {
      ":dayVal": {
          "day":"Tue"
      }
   }
};

console.log("getParams ==>", queryData)

docClient.scan(queryData, function (err, details) {
    if (err) {
        console.log(err, err.stack); // an error occurred
       // callback(err, null)
    }
    else{
       // callback(null, details)
       console.log(details);
   }
});
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