Entity Framework Change Tracking And Automapper - entity-framework-6

Question

Entity Framework classes:
namespace ORM
{
public class Car
{
public int Id { get; set; }
public string Name { get; set; }
public int Price { get; set; }
public virtual List<Wheel> Wheels { get; set; }
}
public class Wheel
{
public int Id { get; set; }
public double Size { get; set; }
public virtual Car Car { get; set; }
}
}
namespace DAL.Entities
{
public class Car
{
public int Id { get; set; }
public string Name { get; set; }
public int Price { get; set; }
public List<Wheel> Wheels { get; set; }
}
public class Wheel
{
public int Id { get; set; }
public double Size { get; set; }
public Car Car { get; set; }
}
}
ORM and DAL models.
Automapper configuration is:
public class DalProfile : Profile
{
public DalProfile()
{
CreateMap<Wheel, Entities.Wheel>()
.ForMember(m => m.Car, opt => opt.Ignore());
CreateMap<Entities.Wheel, Wheel>()
.ForMember(m => m.Car, opt => opt.Ignore());
CreateMap<Car, Entities.Car>()
.AfterMap((src, dest) =>
{
foreach (var wheel in dest.Wheels)
{
wheel.Car = dest;
}
});
CreateMap<Entities.Car, Car>()
.AfterMap((src, dest) =>
{
foreach (var wheel in dest.Wheels)
{
wheel.Car = dest;
}
});
CreateMap<Wheel, Wheel>()
.ForMember(m => m.Car, opt => opt.Ignore());
CreateMap<Car, Car>()
.AfterMap((src, dest) =>
{
foreach (var wheel in dest.Wheels)
{
wheel.Car = dest;
}
});
}
}
Repository class:
public class CarRepository
{
private readonly DbContext context;
public CarRepository(DbContext context)
{
this.context = context;
}
public void Update<T>(int id, T newCar) where T : class
{
var entity = context.Set<T>().Find(id);
Mapper.Map(newCar, entity);
context.SaveChanges();
}
}
Main entry:
static void Main(string[] args)
{
Mapper.Initialize(cfg => cfg.AddProfile(new DalProfile()));
DataContext context = new DataContext();
CarRepository carRepository = new CarRepository(context);
Car car = carRepository.Get(120);
DAL.Entities.Car dalCar = Mapper.Map<Car, DAL.Entities.Car(car);
dalCar.Name = "ew";
dalCar.Wheels[0].Size = 1994;
Car ormCar = Mapper.Map<DAL.Entities.Car, Car>(dalCar);
carRepository.Update(ormCar.Id, ormCar);
}
In my project i have ORM, DAL layers. Inside Update method i want to update only changed values. Of course if do changes with ORM.Car directly like this:
public void Update<T>(ORM.Car car) where T : class
{
var entity = context.Set<Car>().Find(car.id);
entity.Name = "New name";
entity.Wheels[0].Size = 1111;
context.SaveChanges();
}
This works great. Entity framework can update only Name property and related Wheel object.
But in my project i have different layers. So i want to change some properties of DAL.Car than map this object to ORM.Car with Automapper and apply changes like i did with ORM.Car above. But after mapping with Automapper i can't do this cause of Automapper creates new objects after mapping and Entity Framework can't update only needed properties like with ORM.Car directly cause of Dynamic Proxies maybe or i don't know. I want generic Update which looks something like this:
public void Update<T>(int id, T newCar) where T : class
{
var entity = context.Set<T>().Find(id);
Mapper.Map(newCar, entity);
context.SaveChanges();
}
Where newCar is a Car which is converted from DAL.Car;
Can i do this?