We first define the data type we want to save.
In my app, I wanted to store “wishes” — things I want to achieve or buy.

@Model
class Wish {
   public var name: String
   init(name: String) {
       self.name = name
   }
}

That’s it — just a Swift class with @Model and SwiftData does the rest:
It automatically creates the database table, IDs, and relationships behind the scenes.

🧠 Step 2 — Setting up Model Container

We need a ModelContainer to store the data.
This container is like the “database” of our app.

@main
struct SwiftDataApp: App {
   var sharedModelContainer: ModelContainer = {
       let schema = Schema([ Wish.self ])
       let modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false)

       do {
           return try ModelContainer(for: schema, configurations: modelConfiguration)
       } catch {
           fatalError("Could not create ModelContainer: \(error)")
       }
   }()
   
   var body: some Scene {
       WindowGroup {
           SwiftDataView()
               .modelContainer(sharedModelContainer)
       }
   }
}
 

Schema tells SwiftData which models exist

ModelConfiguration sets where data is stored

modelContainer() injects it into the SwiftUI environment

🖥 Step 3 — Querying Data in SwiftUI

SwiftData gives us a @Query property wrapper to fetch data directly into a view.
It automatically watches for changes and updates the UI.

👀 Preview with Empty View

#Preview("Empty Data View") {

    SwiftDataView().modelContainer(for: Wish.self, inMemory: true)
}

👀 Preview with Sample Data