如何在多關係發生變化時執行遷移？

這是我在源模型Business實體：如何在多關係發生變化時執行遷移？

，這就是我在destnation模型Business實體：

正如你可以看到我改變了多方關係，從users到user。

但現在我有以下錯誤：

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

，我不知道該怎麼做要解決這個問題是什麼。有任何想法嗎？

這是我如何設置核心數據堆棧：

 
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) 
}

來源

2016-11-30 Bartłomiej Semańczyk

最簡單的解決方法是刪除當前數據庫，並允許MagicalRecord創建沒有任何遷移一個新的。請記住只做ONCE。

static func mr_setupCoreDataStack() { 

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

}

來源

2016-12-01 11:17:01

如何在多關係發生變化時執行遷移？

回答

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