Same issue with example project from apple (https://developer.apple.com/documentation/swiftdata/adding-and-editing-persistent-data-in-your-app)
Diethus
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You have to add Item to MyItem after Init:
class MyItem {
var name: String
var item: Item?
init(name: String, item: Item) {
self.name = name
setItem(item)
}
func setItem(_ item: item) {
self.item = item
}
}