---
title: NSMigrationEntityMappingKey
framework: coredata
role: symbol
role_heading: Global Variable
path: coredata/nsmigrationentitymappingkey
---

# NSMigrationEntityMappingKey

Key for the entity mapping object.

## Declaration

```swift
let NSMigrationEntityMappingKey: String
```

## Discussion

Discussion To access this key in a custom value expression string in the Xcode mapping model editor use $entityMapping.

## See Also

### Constants

- [NSMigrationManagerKey](coredata/nsmigrationmanagerkey.md)
- [NSMigrationSourceObjectKey](coredata/nsmigrationsourceobjectkey.md)
- [NSMigrationDestinationObjectKey](coredata/nsmigrationdestinationobjectkey.md)
- [NSMigrationPropertyMappingKey](coredata/nsmigrationpropertymappingkey.md)
- [NSMigrationEntityPolicyKey](coredata/nsmigrationentitypolicykey.md)