Class ArrayUnion (2.29.0)

ArrayUnion(values)

Field transform: appends missing values to an array field.

See: https://cloud.google.com/firestore/docs/reference/rpc/google.firestore.v1#google.firestore.v1.DocumentTransform.FieldTransform.FIELDS.google.firestore.v1.ArrayValue.google.firestore.v1.DocumentTransform.FieldTransform.append_missing_elements

Parameter
Name	Description
`values`	`List Tuple` values to append.

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Last updated 2026-08-25 UTC.