Load a previous model version

Question

I am loading a NSManagedObjectModel model with the initWithContentsOfURL: constructor like this:

NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@\"MyDoc         


        

Answer 1

Swift version. Replace file name.

import CoreData

extension NSManagedObjectModel
{
    class func model(forVersion version: Int) -> NSManagedObjectModel?
    {
        if let fileUrl = Bundle.main.url(forResource: "Model.momd/Model \(version)", withExtension: "mom")
        {
            return NSManagedObjectModel(contentsOf: fileUrl)
        }
        return .none
    }
}