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# NSLightweightMigrationStage

An object that describes a series of models suitable for lightweight migration.

```
class NSLightweightMigrationStage
```

## Overview

Use [`NSLightweightMigrationStage`](/documentation/CoreData/NSLightweightMigrationStage) when you have a series of models to migrate and those models are compatible with lightweight migrations. Instances of this class supplement your custom migration stages and help maintain a consistent stage order for the entire migration.

## Topics

### Creating a migration stage

[`init(_:)`](/documentation/CoreData/NSLightweightMigrationStage/init(_:))

Creates a lightweight migration stage with the specified version checksums.

[`-  initWithVersionChecksums:`](/documentation/CoreData/NSLightweightMigrationStage/initWithVersionChecksums:)

Creates a lightweight migration stage with the specified version checksums.

### Accessing the checksums

[`versionChecksums`](/documentation/CoreData/NSLightweightMigrationStage/versionChecksums)

The array of version checksums.

## Relationships

### Conforms To

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

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

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

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

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

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

### Inherits From

[`NSMigrationStage`](/documentation/CoreData/NSMigrationStage)

---

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