Let's say I am doing an update and a delete:
const transactionParams = {
ReturnConsumedCapacity: "INDEXES",
TransactItems: [
{
Delete: {
TableName: reactionTableName,
Key: {
"SOME_PK_",
"SOME_SK_",
},
ReturnValues: 'ALL_OLD',
},
},
{
Update: {
TableName: reviewTableName,
Key: { PK: "SOME_PK", SK: "SOME_SK" },
ReturnValues: 'ALL_OLD',
},
},
],
};
try {
const result = await docClient.transactWrite(transactionParams).promise();
} catch (error) {
context.done(error, null);
}
even thoughI am using ReturnValues as "ALL_OLD" I can't seem to get access to that. Is this possible with transactWrite, or am I required to do a get after and eat up a read?
Have you checked out ItemCollectionMetrics in the response? The docs suggest its a map of table name -> items affected by the query
await docClient.transactWrite(transactWriteItemsQueryParam, (err, data) => {
if (err) {
console.error('Transaction Failed. Error JSON:', JSON.stringify(err, null, 2));
reject(err);
} else {
console.log('Transaction succeeded:', JSON.stringify(data, null, 2));
//data[0].Items -is result of delete query
//data[1].Items -is result of update query
resolve(data);
}
});