# NSManagedObjectContext.DidSaveMessage Posted after a main queue context saves. ``` struct DidSaveMessage ``` ## Overview Only use this message type for contexts with `NSMainQueueConcurrencyType`. ## Topics ### Instance Properties [`let context: NSManagedObjectContext`](/documentation/CoreData/NSManagedObjectContext/DidSaveMessage/context) [`var deleted: Set`](/documentation/CoreData/NSManagedObjectContext/DidSaveMessage/deleted) Managed objects that were deleted during this save. [`let historyToken: NSPersistentHistoryToken?`](/documentation/CoreData/NSManagedObjectContext/DidSaveMessage/historyToken) [`var inserted: Set`](/documentation/CoreData/NSManagedObjectContext/DidSaveMessage/inserted) Managed objects that were inserted during this save. [`let queryGeneration: NSQueryGenerationToken?`](/documentation/CoreData/NSManagedObjectContext/DidSaveMessage/queryGeneration) Query generation token after the save. [`var updated: Set`](/documentation/CoreData/NSManagedObjectContext/DidSaveMessage/updated) Managed objects that were updated during this save. ## Relationships ### Conforms To [`MainActorMessage`](/documentation/Foundation/NotificationCenter/MainActorMessage) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)