swift - iOS 9, 10 CoreData: Failed to load optimized model at path

Question

I have created new version of CoreData model and migrated existing one to it. Application works without any issues on iOS 9+, but for iOS 9 and 10 I am getting this error:

2017-10-22 19:28:37.081 CafeManager[16654:1918728] CoreData: Failed to load optimized model at path '/Users/dj-glock/Library/Developer/CoreSimulator/Devices/A81AA9C4-7B59-4422-BA0A-0FD0D1A05205/data/Containers/Bundle/Application/DD66571C-4EB6-4A8B-A99B-B447DD0FFFBA/CafeManager.app/CafeManager.momd/CafeManager v2.omo'

iOS 10:

CoreData: annotation: Failed to load optimized model at path '/Users/dj-glock/Library/Developer/CoreSimulator/Devices/3708F142-3BD0-4C70-8515-217B7785D285/data/Containers/Bundle/Application/3842402F-BEAE-47CB-8C27-EC6CA7D76B03/CafeManager.app/CafeManager.momd/CafeManager v2.omo'

I have checked a lot of similar questions, but did not find solution for me. I have tried to re-install app on simulator, to re-launch and so on. Can anybody advise?

Folder contains the following files:

AppDelegate CoreData stack for iOS 9:

// MARK: - Core Data stack for iOS 8+
static var managedObjectContext: NSManagedObjectContext = {
    var applicationDocumentsDirectory: URL = {
        let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return urls[urls.count-1]
    }()

    var managedObjectModel: NSManagedObjectModel = {
        let modelURL = Bundle.main.url(forResource: "CafeManager", withExtension: "momd")!
        return NSManagedObjectModel(contentsOf: modelURL)!
    }()

    var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
        let a = managedObjectModel.entities
        let coordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel)
        let url = applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite")
        print(url)
        do
        {
            let options = [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true]
            try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: options)
        } catch {
            NSLog("Error initializing smStore for iOS 8+ - (error.localizedDescription)")
        }
        return coordinator
    }()
    let coordinator = persistentStoreCoordinator
    var managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
    managedObjectContext.persistentStoreCoordinator = coordinator
    return managedObjectContext
}()

Apple developer forum

Possible duplicate of this question.

Answer 1

It seems to be the problem with optimized model versions on < iOS 11. Just use unoptimized .mom model version instead (CafeManager v2.mom).

Here's how I fixed it:

public func managedObjectModel() -> NSManagedObjectModel {
    let omoURL = modelBundle.url(forResource: name, withExtension: "omo", subdirectory: modelDirectoryName)
    let momURL = modelBundle.url(forResource: name, withExtension: "mom", subdirectory: modelDirectoryName)
    guard var url = omoURL ?? momURL else { fatalError("model version (self) not found") }
    // Use unoptimized model version < iOS 11
    if #available(iOS 11, *) {} else { if let momURL = momURL { url = momURL} }
    guard let model = NSManagedObjectModel(contentsOf: url) else { fatalError("cannot open model at (url)") }
    return model
}

If you're thinking, I want my speed, why would I use something unoptimized, read this answer.