Comment effectuer une migration lors d'un changement de relation de plusieurs à un?

Question

C'est ce que j'ai dans le modèle source pour Business entité:

et c'est ce que j'ai dans le modèle de destnation pour Business entité:

Comme vous pouvez le voir, je changé la relation de plusieurs à un, de users à user.

Mais maintenant j'ai l'erreur suivante:

URL:file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/POSowner.sqlite options:{ 
    NSInferMappingModelAutomaticallyOption = 1; 
    NSMigratePersistentStoresAutomaticallyOption = 1; 
} ... returned error Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/POSowner.sqlite, reason=Cannot migrate store in-place: Validation error missing attribute values on mandatory destination relationship, destinationURL=file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/.POSowner.sqlite.migrationdestination_41b5a6b5c6e848c462a8480cd24caef3, NSUnderlyingError=0x170458990 {Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={entity=Business, attribute=user, reason=Validation error missing attribute values on mandatory destination relationship}}} with userInfo dictionary { 
    NSUnderlyingError = "Error Domain=NSCocoaErrorDomain Code=134110 \"An error occurred during persistent store migration.\" UserInfo={entity=Business, attribute=user, reason=Validation error missing attribute values on mandatory destination relationship}"; 
    destinationURL = "file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/.POSowner.sqlite.migrationdestination_41b5a6b5c6e848c462a8480cd24caef3"; 
    reason = "Cannot migrate store in-place: Validation error missing attribute values on mandatory destination relationship"; 
    sourceURL = "file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/POSowner.sqlite"; 
} 
fatal error: 'try!' expression unexpectedly raised an error: Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/POSowner.sqlite, reason=Cannot migrate store in-place: Validation error missing attribute values on mandatory destination relationship, destinationURL=file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/.POSowner.sqlite.migrationdestination_41b5a6b5c6e848c462a8480cd24caef3, NSUnderlyingError=0x170458990 {Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={entity=Business, attribute=user, reason=Validation error missing attribute values on mandatory destination relationship}}}: file /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-800.0.58.6/src/swift/stdlib/public/core/ErrorType.swift, line 178 
2016-11-30 14:25:43.070185 POSowner[3474:513840] fatal error: 'try!' expression unexpectedly raised an error: Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/POSowner.sqlite, reason=Cannot migrate store in-place: Validation error missing attribute values on mandatory destination relationship, destinationURL=file:///private/var/mobile/Containers/Shared/AppGroup/00C2A6C6-8149-4CF7-95E1-6ABD8A2B3B57/.POSowner.sqlite.migrationdestination_41b5a6b5c6e848c462a8480cd24caef3, NSUnderlyingError=0x170458990 {Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={entity=Business, attribute=user, reason=Validation error missing attribute values on mandatory destination relationship}}}: file /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-800.0.58.6/src/swift/stdlib/public/core/ErrorType.swift, line 178 

et je ne sais pas quoi faire pour contourner ce problème. Des idées?

Voilà comment je pile de données de base de configuration:

 
static func mr_setupCoreDataStack() { 

    guard NSPersistentStoreCoordinator.mr_default() == nil else { 
     return 
    } 

    let managedObjectModel = NSManagedObjectModel.mr_default() 
    let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel!) 

    var storePath = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: SharedGroupName) 
    storePath = storePath!.appendingPathComponent("POSowner.sqlite") 

    let options = [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true] 

    try! persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: storePath, options: options) 

    NSPersistentStoreCoordinator.mr_setDefaultStoreCoordinator(persistentStoreCoordinator) 
    NSManagedObjectContext.mr_initializeDefaultContext(with: persistentStoreCoordinator) 
} 

Answer 1

La solution la plus simple est de supprimer la base de données actuelle et permettre MagicalRecord créer une nouvelle sans migrations. N'oubliez pas de le faire seulement UNE FOIS.

static func mr_setupCoreDataStack() { 

    var storePath = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: SharedGroupName) 
    storePath = storePath!.appendingPathComponent("POSowner.sqlite") 
    try! FileManager.default.removeItem(at: storePath!) 

}