SwiftData/ModelCoders.swift:1762: Fatal error: Passed nil for a non-optional keypath

Question

Created Aug ’24

Replies 4

Boosts 3

Participants 5

I updated today at Xcode 16 beta 6, and my app using SwiftData on iOS 18 (beta 6) is getting now this new error when saving the model in the modelContext.

I don't understand if it is a regression introduced in the beta 6 or if it is enforced something that previously wasn't.

It seems to be always referred to the ID property, for example:

SwiftData/ModelCoders.swift:1762: Fatal error: Passed nil for a non-optional keypath \MyModel.id

In this case (and in most of the cases in my models) the ID is defined as following

    @Attribute(.unique)
    public var id: UUID

I also tried to add the initialization inline, but didn't help

    @Attribute(.unique)
    public var id: UUID = .init()

I also tried to remove the @Attribute(.unique), didn't help as well.

Does any of you have the same issue?

Boost

Answer 1

SkinSoftware OP

Aug ’24

Same on iOS 18 Beta 7.

The "funny" thing is that it crashes on the try, the error is not catched.

          ...
          try context.save() <<< Crash
                
            } catch {
                print(error)
            }

0

Answer 2

omegatai OP

Sep ’24

Same here.

0

Answer 3

Juan Arzola OP

Sep ’24

I filed feedback for either this or a similar issue FB15170769 - I reproduced the same Fatal Error but there's no save needed, it happens when a FetchedResultCollection is passed to a SwiftUI List()

0

Answer 4

wguerra OP

Sep ’24

Any information about this? As Juan said, this bug happens if ANY parameter is required.

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