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# NSDeleteRule

Constants that determine what happens when you delete a relationship’s owning managed object.

```
enum NSDeleteRule
```

## Topics

### Delete Rules

[`NSNoActionDeleteRule`](/documentation/CoreData/NSDeleteRule/noActionDeleteRule)

A rule that prevents modification of the referenced managed objects.

[`NSNullifyDeleteRule`](/documentation/CoreData/NSDeleteRule/nullifyDeleteRule)

A rule that nullifies the inverse relationship of the referenced managed objects.

[`NSCascadeDeleteRule`](/documentation/CoreData/NSDeleteRule/cascadeDeleteRule)

A rule that deletes the referenced managed objects.

[`NSDenyDeleteRule`](/documentation/CoreData/NSDeleteRule/denyDeleteRule)

A rule that prevents the deletion of the owning managed object if the relationship has references to other objects.

## Relationships

### Conforms To

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

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

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

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

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

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

---

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