# validateForUpdate() Determines whether the managed object’s current state is valid. ``` func validateForUpdate() throws ``` ## Discussion `NSManagedObject`‘s implementation iterates through all of the receiver’s properties validating each in turn. If this results in more than one error, the `userInfo` dictionary in the `NSError` returned in `error` contains a key `NSDetailedErrorsKey`; the corresponding value is an array containing the individual validation errors. If you pass `NULL` as the error, validation will abort after the first failure. > Important: > Subclasses should invoke super’s implementation before performing their own validation, and should combine any error returned by super’s implementation with their own (see Managed Object Validation). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)