CODEWITHSUNDEEP
javascriptnode.jsasynchronousasync-await
buydadip
buydadip

Reputation: 9407

How to deal with async/await hell?

I have the following...

let user;
let room;
await (async () => {
  user = User.findOne({ room_id: data.room_id });  
  room = Room.findOne({ room_id: data.room_id }); 
})();

await console.log(user, room);

I have multiple database queries and I want them to be asynchronous and at the same time, I want the results to be saved into variables. I tried the code above, but once the console.log gets reached, neither query has been executed yet. The only way I can make it work is if I change it to the following...

let user = await User.findOne({ room_id: data.room_id });  
let room = await Room.findOne({ room_id: data.room_id }); 

await console.log(user, room);

Is there no way to make the queries perform asynchronously but finish executing before console.log() gets reached?

Upvotes: 1

Views: 1632

Answers (1)

Amadan
Amadan

Reputation: 198294

Use Promise.all to wait for multiple parallel promises to finish:

let [user, room] = await Promise.all([
  User.findOne({ room_id: data.room_id }),
  Room.findOne({ room_id: data.room_id })
]);

Upvotes: 16

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