Delete a Firestore field (async)

Delete a Firestore field (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_ref = db.collection("cities").document("BJ")
await city_ref.update({"capital": firestore.DELETE_FIELD})

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