Incrementing a Firestore document field while using shards (async)

Incrementing a Firestore document field while using shards (async).

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Code sample

Python

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

async def increment_counter(self, doc_ref):
    """Increment a randomly picked shard."""
    doc_id = random.randint(0, self._num_shards - 1)

    shard_ref = doc_ref.collection("shards").document(str(doc_id))
    return await shard_ref.update({"count": firestore.Increment(1)})

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