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# didMergeChangesObjectIDsNotification

A notification that posts after a context finishes merging changes from another notification.

```
static let didMergeChangesObjectIDsNotification: Notification.Name
```

## Discussion

This notification’s `object` is the merged context. Don’t peform any asynchronous work or block the calling thread. [`NSManagedObjectContext`](/documentation/CoreData/NSManagedObjectContext) posts notifications to the same thread that creates it.

The `userInfo` dictionary contains the identifiers of the inserted, updated, deleted, refreshed, and invalidated managed objects. For the keys to access those objects, see [`NSManagedObjectContext.NotificationKey`](/documentation/CoreData/NSManagedObjectContext/NotificationKey). It’s safe to capture the dictionary’s contents.

---

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