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How Can I Update More Than 500 Docs In Firestore Using Batch

Updating multiple documents in Firestore can be a breeze when you utilize batch operations. This feature allows you to efficiently make changes to numerous documents in a single request, saving you time and resources. In this article, we will walk you through how to update more than 500 documents in Firestore using batch operations.

Before diving into the code, make sure you have the Firebase SDK set up in your project. Once that's done, you can start by creating a batch object in your code. A batch object in Firestore enables you to group multiple operations together so that they can be executed as a single atomic unit.

To update more than 500 documents using batch operations, you first need to create a reference to the Firestore collection you want to update. Next, initialize a batch object by calling the `batch()` method on the Firestore instance. This creates an empty batch object that can be used to perform multiple operations.

Once you have your batch object ready, you can loop through the documents you want to update and add update operations to the batch. For each document, create a reference to the document and use the `update()` method on the batch object to update the document with the desired data.

Remember that batch operations have a limitation on the number of operations you can include in a single batch. If you need to update more than 500 documents, you can use a loop to create multiple batches, each containing a subset of the documents you want to update. This way, you can efficiently update a large number of documents while staying within the limits.

After adding all the update operations to the batch object, you can commit the batch to Firestore by calling the `commit()` method on the batch object. This will execute all the operations in the batch as a single atomic unit, ensuring that either all updates succeed or fail together.

Javascript

const collectionRef = db.collection('your_collection');
const batchSize = 500;

// Split documents into batches of 500
const batches = [];
let currentBatch = db.batch();
let batchCounter = 0;

collectionRef.get().then(snapshot => {
    snapshot.docs.forEach(doc => {
        const docRef = collectionRef.doc(doc.id);
        currentBatch.update(docRef, { /* update data */ });

        if (++batchCounter === batchSize) {
            batches.push(currentBatch);
            currentBatch = db.batch();
            batchCounter = 0;
        }
    });

    if (batchCounter > 0) {
        batches.push(currentBatch);
    }

    // Commit all batches
    batches.forEach(batch => {
        batch.commit().then(() => {
            console.log('Batch update successful');
        }).catch(error => {
            console.error('Error updating batch:', error);
        });
    });
});

In the code snippet above, we are splitting the documents into batches of 500 and committing each batch to Firestore. This approach ensures that you can efficiently update a large number of documents without hitting any limitations.

Using batch operations to update more than 500 documents in Firestore is a powerful tool that can streamline your workflow and make managing large datasets a breeze. With the right approach and code structure, you can update multiple documents efficiently and effectively.

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