Data Management & Optimization

Apr 4 2025 · Swift 5.10, iOS 17.0, Xcode 15.4

Lesson 03: Data Management Patterns

Demo

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00:02In this demo, you’ll finish updating TheMet app to use multiple data management patterns. You’ll analyze what technologies the app is using, and look to see if any improvements can be made.

Button("Search the Met") {
  modelContext.insert(MetQuery(query: currentMetQuery))
  showQueryField = true
}

func addMetQuery(currentMetQuery: String) {
  modelContext.insert(MetQuery(query: currentMetQuery))
}

private let modelContext: ModelContext

init(modelContext: ModelContext,_ maxIndex: Int = 30) {
  self.modelContext = modelContext
  self.maxIndex = maxIndex
}

@Observable
class TheMetStore {
  var objects: [Object] = []
  private let service = TheMetService()
  private let maxIndex: Int
  private let modelContext: ModelContext
// ... more code below ...

@State private var store: TheMetStore

init(modelContext: ModelContext) {
  let store = TheMetStore(modelContext: modelContext)
  _store = State(initialValue: store)
}

#Preview {
  let config = ModelConfiguration(isStoredInMemoryOnly: true)
      let container = try! ModelContainer(for: MetQuery.self, configurations: config)
  return MetView(modelContext: container.mainContext)
}

init() {
  do {
    container = try ModelContainer(for: MetQuery.self)
  } catch {
    fatalError("Failed to create ModelContainer.")
  }
}

let container: ModelContainer

var body: some Scene {
  WindowGroup {
    MetView(modelContext: container.mainContext).modelContainer(container)
  }
}
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