Hello, In our app, we’ve modeled our schema using inheritance introduced in iOS 26.0, and we’re implementing SwiftData History to re-fetch models only when necessary.
@Model public class Transaction {
@Attribute(.preserveValueOnDeletion)
public var date: Date = Date()
public var amount: Double = 0
public var memo: String?
}
@Model public final class Spending: Transaction {
public var installmentIndex: Int = 1
public var installment: Int = 1
public var installmentID: UUID?
}
If data has been deleted from database, we need to check a date property to determine whether to re-fetch datas.
To do this, we added the preserveValueOnDeletion attribute to date property so we could retrieve it from the History tombstone value.
However, after adding this attribute, a crash occurs. There is a console log
Could not cast value of type 'Swift.ReferenceWritableKeyPath<Shared.ModelSchemaV5.Transaction, Foundation.Date>' (0x106bf8328) to 'Swift.PartialKeyPath<Shared.ModelSchemaV5.Spending>' (0x1094f21d8).
and error log attached
I also tried this in the recent SampleTrip app, and fetching all history after a deletion causes the same crash. Is this issue currently being worked on or under investigation?
