Not able to figure out how to wait until forEach loop iterates completely and use that result
0
I am new to cloud functions (node js with typescript). I am using it to fetch data from Firebase database( as the code below). But Not able to figure out how to wait until forEach loop iterates completely and use that result.
const reference = admin.database().ref('/books')
var path_key:string
var total_count:number = 0
reference .forEach(function (snapshot) {
path_key= snapshot(key).val()
ref_users_advance_bookings.child(path_key)
.once('value').then((snapshot2)=>{
if(condidtion met){
return response.send("failed")
}
else{
total_count++
}
)}
return true
})
// i want to use total_count value here
return response.send("count :"+total_count) // but every time I gets 0, as it get executed before forEach has ended
)}
node.js firebase firebase-realtime-database
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
add a comment |
0
I am new to cloud functions (node js with typescript). I am using it to fetch data from Firebase database( as the code below). But Not able to figure out how to wait until forEach loop iterates completely and use that result.
const reference = admin.database().ref('/books')
var path_key:string
var total_count:number = 0
reference .forEach(function (snapshot) {
path_key= snapshot(key).val()
ref_users_advance_bookings.child(path_key)
.once('value').then((snapshot2)=>{
if(condidtion met){
return response.send("failed")
}
else{
total_count++
}
)}
return true
})
// i want to use total_count value here
return response.send("count :"+total_count) // but every time I gets 0, as it get executed before forEach has ended
)}
node.js firebase firebase-realtime-database
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
What isref? Please check how to create a minimal, complete, verifiable example.
– Frank van Puffelen
Nov 24 '18 at 23:04
add a comment |
0
0
0
I am new to cloud functions (node js with typescript). I am using it to fetch data from Firebase database( as the code below). But Not able to figure out how to wait until forEach loop iterates completely and use that result.
const reference = admin.database().ref('/books')
var path_key:string
var total_count:number = 0
reference .forEach(function (snapshot) {
path_key= snapshot(key).val()
ref_users_advance_bookings.child(path_key)
.once('value').then((snapshot2)=>{
if(condidtion met){
return response.send("failed")
}
else{
total_count++
}
)}
return true
})
// i want to use total_count value here
return response.send("count :"+total_count) // but every time I gets 0, as it get executed before forEach has ended
)}
node.js firebase firebase-realtime-database
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
I am new to cloud functions (node js with typescript). I am using it to fetch data from Firebase database( as the code below). But Not able to figure out how to wait until forEach loop iterates completely and use that result.
const reference = admin.database().ref('/books')
var path_key:string
var total_count:number = 0
reference .forEach(function (snapshot) {
path_key= snapshot(key).val()
ref_users_advance_bookings.child(path_key)
.once('value').then((snapshot2)=>{
if(condidtion met){
return response.send("failed")
}
else{
total_count++
}
)}
return true
})
// i want to use total_count value here
return response.send("count :"+total_count) // but every time I gets 0, as it get executed before forEach has ended
)}
node.js firebase firebase-realtime-database
node.js firebase firebase-realtime-database
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
edited Nov 24 '18 at 23:07
Rakesh Kumar
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
asked Nov 24 '18 at 21:29
Rakesh KumarRakesh Kumar
216
216
What isref? Please check how to create a minimal, complete, verifiable example.
– Frank van Puffelen
Nov 24 '18 at 23:04
add a comment |
What isref? Please check how to create a minimal, complete, verifiable example.
– Frank van Puffelen
Nov 24 '18 at 23:04
What is
ref? Please check how to create a minimal, complete, verifiable example.– Frank van Puffelen
Nov 24 '18 at 23:04
What is
ref? Please check how to create a minimal, complete, verifiable example.– Frank van Puffelen
Nov 24 '18 at 23:04
add a comment |
1 Answer
1
active
oldest
votes
1
My guess is that you're trying to wait for a number of items to load from the database. For that you'll want to use Promise.all(), in something like:
var promises = ;
ref.forEach(function (snapshot) {
path_key= snapshot(key).val()
promises.push(ref_users_advance_bookings.child(path_key).once('value'));
});
Promise.all(promises).then(function(snapshots) {
var failed = false;
snapshot.forEach(function(snapshot2) {
if(condition met){
failed = true;
}
else {
total_count++;
}
)}
if (failed) {
return response.status(500).send("ERROR");
}
else {
return response.send("count :"+total_count);
}
});
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
My guess is that you're trying to wait for a number of items to load from the database. For that you'll want to use Promise.all(), in something like:
var promises = ;
ref.forEach(function (snapshot) {
path_key= snapshot(key).val()
promises.push(ref_users_advance_bookings.child(path_key).once('value'));
});
Promise.all(promises).then(function(snapshots) {
var failed = false;
snapshot.forEach(function(snapshot2) {
if(condition met){
failed = true;
}
else {
total_count++;
}
)}
if (failed) {
return response.status(500).send("ERROR");
}
else {
return response.send("count :"+total_count);
}
});
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
add a comment |
1
My guess is that you're trying to wait for a number of items to load from the database. For that you'll want to use Promise.all(), in something like:
var promises = ;
ref.forEach(function (snapshot) {
path_key= snapshot(key).val()
promises.push(ref_users_advance_bookings.child(path_key).once('value'));
});
Promise.all(promises).then(function(snapshots) {
var failed = false;
snapshot.forEach(function(snapshot2) {
if(condition met){
failed = true;
}
else {
total_count++;
}
)}
if (failed) {
return response.status(500).send("ERROR");
}
else {
return response.send("count :"+total_count);
}
});
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
add a comment |
1
1
1
My guess is that you're trying to wait for a number of items to load from the database. For that you'll want to use Promise.all(), in something like:
var promises = ;
ref.forEach(function (snapshot) {
path_key= snapshot(key).val()
promises.push(ref_users_advance_bookings.child(path_key).once('value'));
});
Promise.all(promises).then(function(snapshots) {
var failed = false;
snapshot.forEach(function(snapshot2) {
if(condition met){
failed = true;
}
else {
total_count++;
}
)}
if (failed) {
return response.status(500).send("ERROR");
}
else {
return response.send("count :"+total_count);
}
});
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
My guess is that you're trying to wait for a number of items to load from the database. For that you'll want to use Promise.all(), in something like:
var promises = ;
ref.forEach(function (snapshot) {
path_key= snapshot(key).val()
promises.push(ref_users_advance_bookings.child(path_key).once('value'));
});
Promise.all(promises).then(function(snapshots) {
var failed = false;
snapshot.forEach(function(snapshot2) {
if(condition met){
failed = true;
}
else {
total_count++;
}
)}
if (failed) {
return response.status(500).send("ERROR");
}
else {
return response.send("count :"+total_count);
}
});
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
answered Nov 24 '18 at 23:09
Frank van PuffelenFrank van Puffelen
239k29382409
239k29382409
add a comment |
add a comment |
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What is
ref? Please check how to create a minimal, complete, verifiable example.– Frank van Puffelen
Nov 24 '18 at 23:04