SwiftData: context.insert() doesn’t persist data [closed]

I’m new to iOS development and currently learning to persist data using SwiftData. I’m building a very simple to-do list app to understand how local persistence works.

However, I’ve hit a wall and when I call context.insert(item), the new task never appears in my list, and my @Query array (items) always has a count of 0. I’ve reviewed documentation, watched tutorials, and even asked ChatGPT, but I still can’t figure out what’s missing.

Here’s my setup:

import Foundation
import SwiftData

@Model
class DataItem: Identifiable {
    var id: UUID = UUID()
    var text: String
    var isCompleted: Bool = false

    init(text: String) {
        self.text = text
    }
}


import SwiftUI

@main
struct SwiftDataIssueApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
        .modelContainer(for: DataItem.self)
    }
}

import SwiftUI
import SwiftData

struct ContentView: View {
    @Environment(\.modelContext) private var context
    @Query private var items: [DataItem]
    @State private var newTask: String = ""

    var body: some View {
        NavigationView {
            List {
                ForEach(items) { item in
                    Text(item.text)
                }
            }
            .navigationTitle(Text("Tasks"))

            VStack {
                TextField("Enter New Task", text: $newTask)
                Button("Add Task", action: addTask)
            }
            .padding()
        }
    }

    func addTask() {
        let item = DataItem(text: newTask)
        context.insert(item)
        print(item.text)
        print(items.count)
        newTask = ""
    }
}

I do want to note that items.count keeps returning 0.

Does anyone know why?