Return array of data from firestore query

Question

I want to retrieve information of all the users who are friends of a particular user. To return a single json array I am pushing data first to an array and then returning the data but looks like data is returning empty due to asynchronous behavior of firestore queries. Can anyone please help how to return data after all values get pushed to it.

export async function getUserFriendsDetails(userId) {
    var data = {
        results: []
    }
    getUser(userId).then((snapshot) => {
        snapshot.data().friends.forEach(friend => {
            getUserDetails(friend).then((result) => {
                data.results.push(result.data()) // data is getting pushed here
            })
        })
    })
    return data;  // data is empty array here
}

Alekhya Satya · Accepted Answer · 2021-01-06 18:21:40Z

1

We can use a callback to return once the entire data is populated.

export async function getUserFriendsDetails(userId) {
    var data = {
        results: []
    }
    getUser(userId).then((snapshot) => {
        snapshot.data().friends.forEach(friend => {
            getUserDetails(friend).then((result) => {
                data.results.push(result.data()) // data is getting pushed here
            })
        },function(data){
          alert(data);// Entire data
          })
    })
    return data;  // data is empty array here
}

answered Jan 6, 2021 at 18:21

Alekhya Satya

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3 Comments

yash03agrawal Over a year ago

still it is returning an empty array.

Alekhya Satya Over a year ago

Write the return statement in the place of alert() statement.

yash03agrawal Over a year ago

Thanks but I tried returning data from there only(where alert is written) but still it is returning null. are there any other options I can try?

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