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Batched Writes - When Does The OnSuccess Method Reached?


Batched Writes - When Does The OnSuccess Method Reached?

By : Mukhtar Edris
Date : November 19 2020, 03:01 PM
hop of those help? A batch write is atomic and so it will either successfully complete all of the writes, or it will fail all of the writes.
So once the batch write completes, it will call the onSuccess() method if it was successful and all writes were committed, or it will call the onFailure() method if it was not successful and none of the writes were committed.
code :


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FireStore Batched writes on different Collections

FireStore Batched writes on different Collections


By : razor_devil
Date : March 29 2020, 07:55 AM
Does that help Batch operations can work across collections. From the documentation on batched writes:
code :
// Get a new write batch
WriteBatch batch = db.batch();

// Set the value of 'NYC'
DocumentReference nycRef = db.collection("cities").document("NYC");
batch.set(nycRef, new City());

// Update the population of 'SF'
DocumentReference sfRef = db.collection("cities").document("SF");
batch.update(sfRef, "population", 1000000L);

// Delete the city 'LA'
DocumentReference laRef = db.collection("cities").document("LA");
batch.delete(laRef);

// Commit the batch
batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() {
    @Override
    public void onComplete(@NonNull Task<Void> task) {
        // ...
    }
});
Is there any benefit to Batched Writes over Transactions other than offline availability?

Is there any benefit to Batched Writes over Transactions other than offline availability?


By : BrittanyKelley
Date : March 29 2020, 07:55 AM
hop of those help? Transactions are not really comparable to batch writes. You should pick the tool that suits the job at hand. The only thing they have in common is that when the operation completes, all the documents will write at the exact same moment (they are atomic). They can also both fail due to violation of a security rule, like any other operation coming from a client app.
Here's how you decide:
Batched Writes or Transaction in Cloud Functions?

Batched Writes or Transaction in Cloud Functions?


By : user2887807
Date : March 29 2020, 07:55 AM
will be helpful for those in need You are only writing to Firestore (and not reading), so at first sight, there is no need to use a transaction since "transactions are useful when you want to update a field's value based on its current value, or the value of some other field" (see doc), and you should use a Batched Write.
However, you should note that "each transaction or batch of writes can write to a maximum of 500 documents" (see same doc). Since you mention that your queries "potentially return hundreds of documents" you may encounter a problem here and have to write in several batches.
Can I use Transactions and batched writes for read only?

Can I use Transactions and batched writes for read only?


By : Mr. Jitu
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Transactions and batched writes are write operations. There's nothing similar for read operations, nor should it really be needed.
If you want to fail subsequent reads, you should:
Firestore Batched Writes operations sequence guarantee

Firestore Batched Writes operations sequence guarantee


By : user3425541
Date : March 29 2020, 07:55 AM
Hope this helps The changes in a batch don't have an order. They happen atomically all at once, or not at all. There is no way any client could get a view of the database with an incomplete batch.
Any security rules that apply to documents the batch will see all documents changed at the same time. The security rules do not apply to individual documents in sequence. If you use getAfter() in security rules to fetch the contents of documents that were changed from the batch, each call to getAfter() will only ever see the new data.
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