What is the equivalent of Java's protected attributes in Nim?

I was playing around with OOP in Nim and when I tried to implement inheritance between two Nim types in different files, I encounter the following problem, when importing a type from other file could not find a way to implement protected attributes.

In the following block of code, it is represented the Java code.

class Vehicle {
  protected String brand = "Ford";        // Vehicle attribute
}

class Car extends Vehicle {
  private String modelName = "Mustang";    // Car attribute
  
   public String getName() {
       return this.brand + " " + this.modelName;
   }
}

class Main {
  public static void main(String[] args) {

    // Create a myCar object
    var myCar = new Car();
    System.out.println(myCar.getName());
  }
}

Is there anything similar to protected attributes in Nim?

Thanks for your time!

Solution

There is no equivalency, Nim only has exported and unexported fields. So if you want to access the brand you need to use * on the field. Though you could likely emulate the same logic as protected using the following 'pattern'.

As such

# vehicles.nim
type Vehicle* = object of RootObj # Or ref object if you want runtime polymorphism
    brand*: string

proc init*(vehicle: var Vehicle) =
  vehicle.brand = "Ford"

# main
import vehicles

type Car = object of Vehicle
  modelName*: string

proc init*(car: var Car) =
  Vehicle(car).init()
  car.modelName = "Mustang"

proc name*(car: Car): string =
  result = car.name
  result.add " "
  result.add car.brand

let car = (var temp = Car(); temp.init(); temp) # Make a constructor to abstract this away I guess
echo car.name