Updating a Firestore document in a transaction (async)

Updating a Firestore document in a transaction (async).

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For detailed documentation that includes this code sample, see the following:

• Transactions and batched writes
• Transactions and batched writes

Code sample

Python

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

transaction = db.transaction()
city_ref = db.collection("cities").document("SF")

@firestore.async_transactional
async def update_in_transaction(transaction, city_ref):
    snapshot = await city_ref.get(transaction=transaction)
    transaction.update(city_ref, {"population": snapshot.get("population") + 1})

await update_in_transaction(transaction, city_ref)

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