Core Data: Beyond the Basics

Jul 26 2022 · Swift 5.5, iOS 15, Xcode 13.3.1

Part 1: Fetching & Displaying Launches

06. Modeling Relationships

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Your RocketLaunch app is coming along quite nicely - you can save rocket launches and mark them as viewed. But there is a pretty big limitation with the app - all launches are added to a single list. In Apple’s Reminders app, for example, you can create multiple lists each with its own set of Reminders. Let’s do the same.

@NSManaged public var launches: [RocketLaunch]

static func create(withTitle title: String, in managedObjectContext: NSManagedObjectContext) {
	let newLaunchList = self.init(context: managedObjectContext)
	newLaunchList.title = title
	
	do {
	  try managedObjectContext.save()
	} catch {
	  let nserror = error as NSError
	  fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
	}
}