swift_dynamicCastClassUnconditional issues in swift

Question

I have the following NSManagedObject in swift:

import Foundation
import CoreData

public class User: NSManagedObject {

    @NSManaged public var fi         


        

Answer 1

I got the solution here:

Swift: Breakpoint in CoreData library

Basically I had to put @objc(User) right above managed object code. So as per below:

@objc(User)
public class User: NSManagedObject {
    @NSManaged public var first_name: String
    @NSManaged public var last_name: String
}

This solved the problem. Case closed.