CODEWITHSUNDEEP
javascriptnode.jsasynchronousmongoosees6-promise
Dürrani
Dürrani

Reputation: 1266

Javascript - Call two async functions parallel and pass both results to a third one

I want to call two mongoose queries "Parallel" and pass the returned data of both the queries to client side.

//both queries should be called parallel, not one after another

//query 1
PaperModel.find().then((papers) => {
});

//query 2
ConferenceModel.find().then((conferences) => {
});

//this function should only be called when both the
//queries have returned the data
res.render('Home', {
    Papers: papers
    Conferences: conferences
});

I tried to look at this but didn't get it well. Thanks

Upvotes: 0

Views: 740

Answers (1)

Łukasz Blaszyński
Łukasz Blaszyński

Reputation: 1565

If PaperModel.find() and ConferenceModel.find() returning promises you can use something like in code below:

//query 1
const papers = PaperModel.find();

//query 2
const conferences = ConferenceModel.find();

Promise.all([papers, conferences]).then((values) => {
    res.render('Home', {
        Papers: values[0]
        Conferences: values[1]
    });
})

and another option with wrapping function with async await syntax

const getData = async () => {
  const papers = PaperModel.find();
  const conferences = ConferenceModel.find();

  const values = await Promise.all([papers, conferences]);

  res.render('Home', {
    Papers: values[0]
    Conferences: values[1]
  });
}

Upvotes: 1

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