Reputation: 190
I'm building an app using firebase and Node.js. I need to get data from nested foreach. How to do it correctly? Need to return the results of all iterations simultaneously.
exports.userParty = function (userInfo, cb) {
var userID = userInfo.userID;
var clubID = userInfo.clubID;
var refUserParty = ref.child(userID).child('my_party_id');
var party = {};
refUserParty.orderByValue().once("value", function (snapshot) {
var party = {};
snapshot.forEach(function (partyID) {
var refParty = dbb.ref('clubs').child(clubID).child('party').child(partyID.val());
refParty.once('value', function (partyBody) {
party[partyID.val()] = partyBody.val();
//console.log(party);
});
});
cb(party); // {}
});
};
Upvotes: 0
Views: 481
Reputation: 1984
You need to call the callback after all the async functions in the forEach
block have completed. You can do this using a simple counter to check all async functions are complete:
...
let completedSnapshots = 0;
snapshot.forEach(function (partyID) {
var refParty = dbb.ref('clubs').child(clubID).child('party').child(partyID.val());
refParty.once('value', function (partyBody) {
party[partyID.val()] = partyBody.val();
completedSnapshots++;
if (completedSnapshots === snapshot.val().length) {
cb(party);
}
});
});
...
Upvotes: 1