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How to perform transaction which includes both firebase real-time database and firestore?


How to perform transaction which includes both firebase real-time database and firestore?

By : VARSHAN
Date : January 12 2021, 07:00 PM
I hope this helps you . There is no way to run a single transaction across both Cloud Firestore and the Realtime Database.
You'll have to find a way to write the data in two separate transactions, and make sure your code that reads the data is robust enough to handle the case where one transaction has completed while the other hasn't.
code :


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Difference between real-time database and fireStore in firebase?

Difference between real-time database and fireStore in firebase?


By : linaweb
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Why you should use firestore over realtime db: Shallow queries Fetching a node does not fetch you all of the subnodes together Queries can be done on multiple fields Realtime db only support querying on a single field Queries scale to size of result set, not size of data set Search for top 10 will take same amount of time whether you have 300, 300 thousand or 30 million entries Manual fetching of data One time fetch queries is the primary use case, listeners for realtime updates is configurable. See Getting Realtime Updates with Cloud Firestore Multi region support Redundant database (not sure about realtime db redundancy but it does have an auto backup price plan) Different pricing model Price based on number of reads and writes, not amount of data downloaded (can be good or bad depends on usage, see below) Why you should use realtime db over firestore: Slightly better latency Faster update on client than firestore Native support for presence User online status is easier to be implemented on realtime db Pricing model If your app does a lot of reads and writes with small data, realtime db can be cheaper than firestore Firestore is still beta Realtime db has been in production for four years, firestore is just recently released TL;DR:
New apps should start with firestore.
Firebase real time database transaction while offline

Firebase real time database transaction while offline


By : user1512573
Date : March 29 2020, 07:55 AM
it fixes the issue Firebase Realtime Database (and Firestore) don't support offline transactions at all. This is because a transaction must absolutely round trip with the server at least once in order to safely commit the changes to the data, while also avoiding collisions with other clients that could be trying to change the same data.
If you're wondering why the SDK doesn't just persist the callback that handles the transaction, all that can be said is that persisting an instance of an object (and all of its dependent state, such as the values of all variables in scope) is actually very difficult, and is not even possible in all environments. So, you can expect that transaction only work while the client app is online and able to communicate with the server.
Stop a query in real time on firebase firestore

Stop a query in real time on firebase firestore


By : Fariborz Asgari
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The type of the variable unsubscribe is a "Subscriber". So, you can call the unsubscribe() method on that variable. The official docs are a bit misleading.
code :
var collectionObservable = db.collection('students').doc('NnBOX9f9kvBKerGKdbAi').snapshotChanges();

var subscription = collectionObservable.subscribe(res => {
  console.log(res);
});

subscription.unsubscribe();
Within a firebase project, can I update values in the firestore database from the real time database

Within a firebase project, can I update values in the firestore database from the real time database


By : Bharath Arjun Km
Date : March 29 2020, 07:55 AM
I wish did fix the issue. There is an integer value in the my real time database that I'd like to have sync'd with an integer value in my firestore database. The realtime database is fed through an external source and when it gets an update, I'd like that pushed to the firestore database , By doing
code :
var userDoc = admin.firestore().doc(`user/${context.params.user1}`);
exports.meterSync = functions.database
  .ref('/{userId}/meter')
  .onUpdate((change, context) => {

    const meterReading = change.after.val();
    console.log(meterReading);

    // Get a reference to the Firestore document of the changed user
    const userDoc = admin.firestore().doc(`user/${context.params.userId}`);

    return userDoc.set(
      {
        meter: meterReading
      },
      { merge: true }
    );
  });
Difference between Firebase real-time database and Cloud Firestore

Difference between Firebase real-time database and Cloud Firestore


By : antirobotrobot
Date : March 29 2020, 07:55 AM
I wish this helpful for you A developer advocate answers in blog post
The main points:
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