此方法在 Xcode 15 beta 7 之前有效：
@Model
final class Item {
var name: String
@Relationship(inverse:\Note.item) var notes: [Note]
init(name: String = "Item name") {
self.name = name
self.notes = []
}
}
@Model final class Note {
var name: String
var item: Item
init(name: String = "Note name", item: Item) {
self.name = name
self.item = item
}
}
@main
struct LifeKPIs_SwiftData_PlaygroundApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
.modelContainer(for: [Item.self, Note.self])
}
}
struct ContentView: View {
@Environment(\.modelContext) private var modelContext
var body: some View {
//...
let item = Item()
modelContext.insert(item)
//...
let note = Note( item: item) //Error here
}
}
Thread 1: "Illegal attempt to establish a relationship 'item' between objects in different contexts (source = <NSManagedObject: 0x6000021c3020> (entity: Note; id: 0x60000030ef00 <x-coredata:///Note/t0C99AC11-423B-4942-9B5D-C9F9E6A4370E7>; data: {\n item = nil;\n name = \"Note name\";\n}) , destination = <NSManagedObject: 0x60000212d400> (entity: Item; id: 0xabdd96b5daee1528 <x-coredata://4C4C1274-3F87-425E-837F-F2AEFD751084/Item/p1>; data: {\n name = \"New Item 0\";\n notes = (\n );\n}))"
None
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