Add a Firestore document using an autogenerated id (async)

Add a Firestore document using an autogenerated id (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.

city = City(name="Tokyo", state=None, country="Japan")
await db.collection("cities").add(city.to_dict())

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