javascript - Firestore transaction update multiple documents in a single transaction

Javascript - Firestore transaction update multiple documents in a single transaction

In Firestore, you can update multiple documents in a single transaction by using the runTransaction method. Here's how you can do it in JavaScript:

const admin = require('firebase-admin'); // Initialize Firebase Admin SDK admin.initializeApp(); const db = admin.firestore(); // Example function to update multiple documents in a single transaction async function updateMultipleDocumentsInTransaction(documentsToUpdate) { const transaction = db.runTransaction(); try { const results = await transaction.run(async transaction => { const promises = documentsToUpdate.map(async doc => { const docRef = db.collection(doc.collection).doc(doc.id); const snapshot = await transaction.get(docRef); const data = snapshot.data(); // Update the document using transaction.update() transaction.update(docRef, { ...data, ...doc.data }); }); // Wait for all updates to complete return Promise.all(promises); }); console.log('Documents updated successfully:', results); } catch (error) { console.error('Error updating documents:', error); } } // Example usage: const documentsToUpdate = [ { collection: 'users', id: 'user1', data: { name: 'Updated Name 1' } }, { collection: 'users', id: 'user2', data: { name: 'Updated Name 2' } } ]; updateMultipleDocumentsInTransaction(documentsToUpdate);

In this example:

  • We define a function updateMultipleDocumentsInTransaction that takes an array of objects documentsToUpdate, where each object represents a document to be updated. Each object contains the collection name, document ID, and the data to be updated.
  • Inside the function, we start a Firestore transaction using db.runTransaction().
  • We then use transaction.run() to execute the transaction. Inside the transaction, we use map() to iterate over each document to be updated.
  • For each document, we fetch its current data using transaction.get(), update it with the new data using transaction.update(), and finally, return a Promise that resolves when all updates are complete.
  • After the transaction completes successfully, we log a success message along with the results of the updates.
  • If any error occurs during the transaction, we log an error message.

This approach allows you to update multiple documents in Firestore atomically within a single transaction, ensuring data consistency.

Examples

  1. "Firestore update multiple documents in transaction JavaScript"

    Description: This query seeks information on how to update multiple documents within a single transaction in Firestore using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); const doc1 = await transaction.get(docRef1); const doc2 = await transaction.get(docRef2); // Perform updates on doc1 and doc2 transaction.update(docRef1, { /* updated data for doc1 */ }); transaction.update(docRef2, { /* updated data for doc2 */ }); });

  2. "Firestore JavaScript transaction update multiple docs"

    Description: This query is about using a JavaScript transaction to update multiple documents simultaneously in Firestore.

    const transaction = db.runTransaction(async (transaction) => { const batch = db.batch(); const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); batch.update(docRef1, { /* updated data for doc1 */ }); batch.update(docRef2, { /* updated data for doc2 */ }); await batch.commit(); });

  3. "Firestore transaction update multiple documents JavaScript example"

    Description: This query is looking for an example of updating multiple documents within a single transaction in Firestore using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); const doc1 = await transaction.get(docRef1); const doc2 = await transaction.get(docRef2); // Perform updates on doc1 and doc2 transaction.update(docRef1, { /* updated data for doc1 */ }); transaction.update(docRef2, { /* updated data for doc2 */ }); });

  4. "Firestore JavaScript transaction update multiple documents example"

    Description: This query is looking for an example of how to update multiple documents in Firestore within a JavaScript transaction.

    const transaction = db.runTransaction(async (transaction) => { const batch = db.batch(); const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); batch.update(docRef1, { /* updated data for doc1 */ }); batch.update(docRef2, { /* updated data for doc2 */ }); await batch.commit(); });

  5. "Firestore JavaScript update multiple documents in single transaction"

    Description: This query focuses on updating multiple documents within a single transaction in Firestore using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); const doc1 = await transaction.get(docRef1); const doc2 = await transaction.get(docRef2); // Perform updates on doc1 and doc2 transaction.update(docRef1, { /* updated data for doc1 */ }); transaction.update(docRef2, { /* updated data for doc2 */ }); });

  6. "Firestore JavaScript transaction update multiple documents simultaneously"

    Description: This query is about updating multiple documents simultaneously within a Firestore transaction using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const batch = db.batch(); const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); batch.update(docRef1, { /* updated data for doc1 */ }); batch.update(docRef2, { /* updated data for doc2 */ }); await batch.commit(); });

  7. "Firestore JavaScript transaction update multiple documents in one go"

    Description: This query looks for a way to update multiple documents in Firestore within a single transaction using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); const doc1 = await transaction.get(docRef1); const doc2 = await transaction.get(docRef2); // Perform updates on doc1 and doc2 transaction.update(docRef1, { /* updated data for doc1 */ }); transaction.update(docRef2, { /* updated data for doc2 */ }); });

  8. "Firestore JavaScript transaction update multiple documents at once"

    Description: This query seeks information on how to update multiple documents at once within a Firestore transaction using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const batch = db.batch(); const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); batch.update(docRef1, { /* updated data for doc1 */ }); batch.update(docRef2, { /* updated data for doc2 */ }); await batch.commit(); });

  9. "Firestore JavaScript transactional update for multiple docs"

    Description: This query is about performing a transactional update for multiple documents in Firestore using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); const doc1 = await transaction.get(docRef1); const doc2 = await transaction.get(docRef2); // Perform updates on doc1 and doc2 transaction.update(docRef1, { /* updated data for doc1 */ }); transaction.update(docRef2, { /* updated data for doc2 */ }); });

  10. "Firestore JavaScript transactional update multiple documents"

    Description: This query is looking for a way to perform a transactional update on multiple documents in Firestore using JavaScript.

    const transaction = db.runTransaction(async (transaction) => { const batch = db.batch(); const docRef1 = db.collection('collectionName').doc('doc1'); const docRef2 = db.collection('collectionName').doc('doc2'); batch.update(docRef1, { /* updated data for doc1 */ }); batch.update(docRef2, { /* updated data for doc2 */ }); await batch.commit(); });

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