Thank you for your reply @Claude31!
Saving the context did unfortunately not help. Interestingly I could recreate the same issue using plain Swift structs as models instead of SwiftData, so it seems to be related to SwiftUI rather than SwiftData.
The link that you provided led me to another Apple sample project in which I was able to find a solution:
Provide the list with a selection, and
Use NavigationLink with value and move detail to the NavigationSplitView
I'm including these changes below in case anyone else runs into the same issue:
import SwiftUI
import SwiftData
struct ContentView: View {
@Environment(\.modelContext) private var modelContext
@Query private var items: [Item]
@State private var selection: Item?
var body: some View {
NavigationSplitView {
List(selection: $selection) {
ForEach(items) { item in
NavigationLink(value: item) {
Text(item.timestamp, format: Date.FormatStyle(date: .numeric, time: .standard))
}
}
.onDelete(perform: deleteItems)
}
.navigationSplitViewColumnWidth(min: 180, ideal: 200)
.toolbar {
ToolbarItem {
Button(action: addItem) {
Label("Add Item", systemImage: "plus")
}
}
}
} detail: {
if let item = selection {
Text("Item at \(item.timestamp, format: Date.FormatStyle(date: .numeric, time: .standard))")
} else {
Text("Select an item")
}
}
}
private func addItem() {
withAnimation {
let newItem = Item(timestamp: Date())
modelContext.insert(newItem)
}
}
private func deleteItems(offsets: IndexSet) {
withAnimation {
for index in offsets {
modelContext.delete(items[index])
}
}
}
}
