---
title: "migrateStore(from:type:options:mapping:to:type:options:)"
framework: coredata
role: symbol
role_heading: Instance Method
path: "coredata/nsmigrationmanager/migratestore(from:type:options:mapping:to:type:options:)"
---

# migrateStore(from:type:options:mapping:to:type:options:)

Migrates the source store to the destination using the specified mapping model.

## Declaration

```swift
func migrateStore(from sourceURL: URL, type sourceType: NSPersistentStore.StoreType, options sourceOptions: [AnyHashable : Any]? = nil, mapping: NSMappingModel, to destinationURL: URL, type destinationType: NSPersistentStore.StoreType, options destinationOptions: [AnyHashable : Any]? = nil) throws
```

## Parameters

- `sourceURL`: The location of the store to migrate.
- `sourceType`: The persistent store type of the store you’re migrating from. For possible values, see doc://com.apple.coredata/documentation/CoreData/NSPersistentStore/StoreType.
- `sourceOptions`: A dictionary of options to apply to the source store. For possible values, see doc://com.apple.coredata/documentation/CoreData/NSPersistentStoreCoordinator.
- `mapping`: The mapping model that converts the entities in the source store to those in the destination store.
- `destinationURL`: The location of the destination store.
- `destinationType`: The persistent store type of the store you’re migrating to. For possible values, see doc://com.apple.coredata/documentation/CoreData/NSPersistentStore/StoreType.
- `destinationOptions`: A dictionary of options to apply to the destination store. For possible values, see doc://com.apple.coredata/documentation/CoreData/NSPersistentStoreCoordinator.

## Discussion

Discussion A store must exist at sourceURL; otherwise, the migration fails. Before the migration occurs, the method ensures compatibility between the source model, the destination model, and the mapping model. If a store doesn’t exist at destinationURL, Core Data creates one as part of the migration; otherwise, the migration updates the existing store.

## See Also

### Performing a Migration

- [migrateStore(from:sourceType:options:with:toDestinationURL:destinationType:destinationOptions:)](coredata/nsmigrationmanager/migratestore(from:sourcetype:options:with:todestinationurl:destinationtype:destinationoptions:).md)