According to my experiments SwiftData does not work with model attributes of primitive type UInt64. More precisely, it crashes in the getter of a UInt64 attribute invoked on an object fetched from the data store.
With Core Data persistent UInt64 attributes are not a problem. Does anyone know whether SwiftData will ever support UInt64?
With the latest runtime libraries on macOS 15.3.1 it seems to work, the crash cannot be reproduced anymore, using the same test code as about one year ago.
Glad the issue for with with macOS 15.3.1, what version of macOS did you see the crash? Do you have a bug number (FB) filed? Thanks
Albert Pascual Worldwide Developer Relations.