Create a Firestore subcollection reference (async)

Create a Firestore subcollection reference (async).

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

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

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room_a_ref = db.collection("rooms").document("roomA")
message_ref = room_a_ref.collection("messages").document("message1")

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