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# NSPersistentHistoryTransaction

A set of changes in the persistent history based on a context save or batch operation.

```
class NSPersistentHistoryTransaction
```

## Topics

### Requesting Notifications

[`-  objectIDNotification`](/documentation/CoreData/NSPersistentHistoryTransaction/objectIDNotification())

Obtains a notification for use in merging the transaction’s changes into a managed object context.

### Customizing History Fetch Requests

[`fetchRequest`](/documentation/CoreData/NSPersistentHistoryTransaction/fetchRequest)

A fetch request that has the persistent history transaction as the entity.

[`entityDescription`](/documentation/CoreData/NSPersistentHistoryTransaction/entityDescription)

The entity description of the persistent history transaction entity.

[`+  entityDescriptionWithContext:`](/documentation/CoreData/NSPersistentHistoryTransaction/entityDescription(with:))

Requests an entity description using the provided context for the managed object type affected by the transaction.

### Inspecting Transaction Details

[`author`](/documentation/CoreData/NSPersistentHistoryTransaction/author)

A granular description of the context that made the persistent history change, if available.

[`bundleID`](/documentation/CoreData/NSPersistentHistoryTransaction/bundleID)

The originating bundle’s identifier.

[`changes`](/documentation/CoreData/NSPersistentHistoryTransaction/changes)

The array of persistent history changes.

[`contextName`](/documentation/CoreData/NSPersistentHistoryTransaction/contextName)

The originating context’s name.

[`processID`](/documentation/CoreData/NSPersistentHistoryTransaction/processID)

The originating process’s identifier.

[`storeID`](/documentation/CoreData/NSPersistentHistoryTransaction/storeID)

The originating store’s identifier.

[`timestamp`](/documentation/CoreData/NSPersistentHistoryTransaction/timestamp)

The date of the persistent history change.

[`token`](/documentation/CoreData/NSPersistentHistoryTransaction/token)

The token that represents this transaction in the persistent history.

[`transactionNumber`](/documentation/CoreData/NSPersistentHistoryTransaction/transactionNumber)

The transaction’s numeric identifier.

## Relationships

### Conforms To

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Hashable`](/documentation/Swift/Hashable)

[`Equatable`](/documentation/Swift/Equatable)

[`NSCopying`](/documentation/Foundation/NSCopying)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`CVarArg`](/documentation/Swift/CVarArg)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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