Overview

• Successor to Core Data - Modern persistence framework from Apple
• Built with SwiftUI in mind - Seamless integration with SwiftUI's declarative syntax
• Auto-save by default - Changes are automatically persisted without explicit save calls

Core Concepts

Model Container & Context

• Container: Manages the persistent storage (the database)
• Context: Working space where you perform CRUD operations
• Flow: Work with context → Save changes → Persisted in container

// Setup in App file
.modelContainer(for: [Expense.self])

The @Model Macro

Marks a class as a SwiftData model and automatically generates:

• Persistence logic
• Observable properties
• Change tracking
• Relationship management

@Model
class Expense {
    var name: String
    var date: Date
    var value: Double

    init(name: String, date: Date, value: Double) {
        self.name = name
        self.date = date
        self.value = value
    }
}