How to create an extension to deal with multiple core data entities

I have two core data entities named Car and Owner, both, obviously NSManagedObject and as all core data entities, all are @Observable by default.

I have created a class where I was observing one of these entities, something like:

class RadioControlModel {

  @ObservedObject var carEntity:Car

  // ... bla bla

  init(_ carEntity:Car, _ name:String) {
    self.carEntity = readCarEntityWith(name)
  }
}

this class is the model of a radio control that allows the user to switch the state of a boolean value of the Car entity.

Now I need to do the same to the Owner entity, that is, to use this class to change a boolean value of this class but the init is tied to Car. How do I declare this as generic so RadioControlModel can accept any core data entity, not just of type Car.

My problem here is to do so and continue to have the variable @Observable, that is, responding to changes.

Solution 1:

Try this:

class RadioControlModel<T: NSManagedObject> {

  @ObservedObject var carEntity:T

  // ... bla bla

  init(_ carEntity:T, _ name:String) {
    self.carEntity = readCarEntityWith(name)
  }
}