Update a Firestore document containing an array field (async)

Update a Firestore document containing an array field (async).

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

• Add data to Cloud Firestore
• Adding data

Code sample

Python

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city_ref = db.collection("cities").document("DC")

# Atomically add a new region to the 'regions' array field.
await city_ref.update({"regions": firestore.ArrayUnion(["greater_virginia"])})

# // Atomically remove a region from the 'regions' array field.
await city_ref.update({"regions": firestore.ArrayRemove(["east_coast"])})

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