Hello, I have the problem that I want to create a relationship between a list and its items. I have created relationships and also selected one-to-many for the list. But when I create multiple lists and add an item in the list, this item is added to each list and not only to the one. How can I set that the item is only added to the list that was selected?
Lists code
import SwiftUI
import CoreData
import Foundation
struct ContentView: View {
@Environment(\.managedObjectContext) private var viewContext
@FetchRequest(sortDescriptors: []) var items: FetchedResults<Item>
@State private var name: String = ""
var body: some View {
NavigationView {
VStack{
TextField("Text eingeben", text: $name)
.padding()
Button {
addItem()
} label: {
Text("Save")
}.padding()
List {
ForEach(items, id: \.self) { item in
NavigationLink(destination: ToDo()) {
Text(item.name ?? "Not found")
}
// Text(item.name ?? "Not found")
}
.onDelete(perform: deleteItems)
}
}
}
}
private func addItem() {
withAnimation {
let newItem = Item(context: viewContext)
newItem.name = name
newItem.id = UUID()
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
private func deleteItems(offsets: IndexSet) {
withAnimation {
offsets.map { items[$0] }.forEach(viewContext.delete)
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
}
}
items list
import SwiftUI
import Foundation
import CoreData
struct ToDo: View {
@Environment(\.managedObjectContext) private var viewContext
@FetchRequest(sortDescriptors: []) var todos: FetchedResults<ToDos>
@State private var todo: String = ""
var body: some View {
NavigationView {
VStack{
TextField("Text eingeben", text: $todo)
.padding()
Button {
addItem()
} label: {
Text("Save")
}.padding()
List {
ForEach(todos, id: \.self) { todos in
Text(todos.todo ?? "Not found")
}
.onDelete(perform: deleteItems)
}
}
}
}
private func addItem() {
withAnimation {
let newToDo = ToDos(context: viewContext)
newToDo.todo = todo
newToDo.id = UUID()
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
private func deleteItems(offsets: IndexSet) {
withAnimation {
offsets.map { todos[$0] }.forEach(viewContext.delete)
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
}
struct ToDo_Previews: PreviewProvider {
static var previews: some View {
ToDo()
}
}
Thank you!
