Get a Firestore document using custom types (async)

Get a Firestore document using custom types (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.

doc_ref = db.collection("cities").document("BJ")

doc = await doc_ref.get()
city = City.from_dict(doc.to_dict())
print(city)

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