Currently, I am developing a scenario where I use flatMap alongside Promise.all. Within the flatMap function, there are two specific conditions to consider: firstly, checking if the state of the originalObj is false or not before proceeding with the insertRealStartTime, and secondly, regardless of this condition, implementing the Event.updateMany for each event. Additionally, I need to ensure that the return value of Events.updateMany() indicates the success of the update operation.
function async foo(){
const eventPromises = events.flatMap(async (event) => {
if (event.state.matchPhase == "1H") {
// simpleQuery is async function
const originalObj = await simpleQuery({ id: event.id });
if (originalObj.state == false) {
// insertRealStartTime is async function
await insertRealStartTime(event.id);
}
}
// Event.updateMany is async function
await Events.updateMany(
{ ...event, expireAt: event["startTime"] },
);
}
);
const all = await Promise.all(eventPromises);
console.log(all)
}
Upon executing the code, I noticed that the output in console.log(all) displays an array of undefined. It appears that the misuse of await within flatMap might be causing this issue, as it interferes with the purpose of using Promise.all. How can I properly handle these conditional statements in order to execute the asynchronous functions based on the conditions while utilizing Promise.all effectively?