Firebase transaction to update multiple fields in a document at once - node.js

Question

I am trying to read a single field in a firestore document, increment the field by one and update the field along side two other fields in the document.
It seems firebase transaction update() function accept a JSON object with only one field and value because when I add other fields to the JSON, the update fails.
This works:
t.update(referralCodesDocRef, {field1: value1});
This does not work:
t.update(referralCodesDocRef, {
field1: value1,
field2: value2,
field3: value3
});
Also this does not work:
t.update(referralCodesDocRef, {field1: value1});
t.update(referralCodesDocRef, {field2: value2});
t.update(referralCodesDocRef, {field3: value3});
Here is the function that does the transaction
function runIncreaseCountTransaction(referralCodesDocRef){
return db.runTransaction(t => {
return t.get(referralCodesDocRef)
.then(doc => {
console.log(doc);
let newReferralCount = doc.data().referral_count + 1;
if(newReferralCount === max_referral_count){
const current_time_millis = Date.now();
const end_time_millis = current_time_millis+(180*1000); // ends after 3 mins
t.update(referralCodesDocRef, {referral_count: newReferralCount});
t.update(referralCodesDocRef, { timer_start_time: current_time_millis });
t.update(referralCodesDocRef, { timer_end_time: end_time_millis });
}
else{
t.update(referralCodesDocRef, { referral_count: newReferralCount });
}
return Promise.resolve(newReferralCount);
})
.then(result => {
console.log('Success: Update successful: Referral count incremented!!', result);
return true;
}).catch(err => {
console.log('Error: could not update referral count', err);
});
});
}
So how can I achieve multiple fields update with firebase transactions?

Answer 1

None of the answers are correct (at least didn't work for me).
Kotlin
Here is my implementation. Very easy:
val db = Firebase.firestore
db.collection("Users")
.document("Ronaldo")
.update("famous", true,
"distance", 5)
.addOnSuccessListener {...
.addOnFailureListener {...
So basically add another comma after your first pair

Answer 2

There should be no problem at all to update a document with a JavaScript object composed of several properties, like
t.update(referralCodesDocRef, {
field1: value1,
field2: value2,
field3: value3
});
The problem most probably comes from the fact that you don't return the Transaction returned by the Transaction's update() method. The following should do the trick:
function runIncreaseCountTransaction(referralCodesDocRef){
return db.runTransaction(t => {
return t.get(referralCodesDocRef)
.then(doc => {
console.log(doc);
let newReferralCount = doc.data().referral_count + 1;
if (newReferralCount === max_referral_count) {
const current_time_millis = Date.now();
const end_time_millis = current_time_millis+(180*1000); // ends after 3 mins
return t.update(referralCodesDocRef,
{
referral_count: newReferralCount,
timer_start_time: current_time_millis,
timer_end_time: end_time_millis
});
} else{
return t.update(referralCodesDocRef, { referral_count: newReferralCount });
}
});
})
.then(result => {
console.log('Success: Update successful: Referral count incremented!!', result);
return null;
})
.catch(err => {
console.log('Error: could not update referral count', err);
return null; //Note the return here.
});
}

Answer 3

Kotlin
You can update multiple fields in a Firestore document using the field, value, field, value... format:
db.collection("users").doc("docID").update({
"field1", value1, // field, value
"field1, "value2" // field, value
})
If you want to update a nested field, you have a couple options.
Use the dot notation like you mentioned:
db.collection("users").doc("docID").update({
"field1", value1,
"field2.subfield2", value2,
"field2.subfield3", value3
})
Make your "value" a map:
db.collection("users").doc("docID").update({
"field1", value1,
"field2", mapOf(
"field3" to value3,
"field4" to value4
})