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unwrapAndLookup(_:thenApply:)

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mattpolzin edited this page Jan 10, 2021 · 1 revision

unwrapAndLookup(_:thenApply:)

Unwrap and look up the value pointed to by the KeyPath. Fail with a ValidationError if the value is nil or not found in the Components for the current document.

public func unwrapAndLookup<T, U>(_ path: KeyPath<T, Either<JSONReference<U>, U>?>, thenApply validations: Validation<U>) -> (ValidationContext<T>) -> [ValidationError]

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