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:

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.