Query a Firestore collection with an array_contains filter (async)

Query a Firestore collection with an array_contains filter (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.

cities_ref = db.collection("cities")

query = cities_ref.where(
    filter=FieldFilter("regions", "array_contains", "west_coast")
)

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