Core Data quiz

Test your Core Data knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What is `@FetchRequest` in SwiftUI, and how does it relate to Core Data?

1. What is `@FetchRequest` in SwiftUI, and how does it relate to Core Data?
2. What is a lightweight migration in Core Data?
3. What is `NSFetchRequest` used for?
4. What does `NSManagedObjectContext.mergePolicy` control?
5. What is the role of `NSPersistentContainer`?
6. What is the purpose of the `.xcdatamodeld` file (the model editor)?
7. What is `NSManagedObjectID` and why is it the recommended way to pass a reference to a managed object across contexts?
8. What is the difference between a Core Data "attribute" and a "relationship" on an entity?
9. What does `NSBatchDeleteRequest` provide that a normal fetch-then-delete loop doesn't?
10. What does `NSPredicate(format: "age > %d", 18)` do when attached to a fetch request?
11. What is Core Data with CloudKit integration (`NSPersistentCloudKitContainer`) used for?
12. What must you do after modifying properties on a fetched `NSManagedObject` to persist the change?

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