Here is the code I finally created by myself:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(EstimateViewModel estimateView)
{
var estimate = db.Estimates.Find(estimateView.EstimateId);
if (estimate == null)
ModelState.AddModelError(String.Empty,"Unknown estimate number");
if (ModelState.IsValid)
{
// Remove for lines from DB
estimate.Lines.ToArray().ForEach(line => db.EstimateLines.Remove(line));
// Map user input
estimate.InjectFrom<DeepCloneInjection>(estimateView);
// Update in db
try
{
db.SaveChanges();
return RedirectToAction("Index");
}
catch (DbEntityValidationException dbEx)
{
foreach (var error in dbEx.EntityValidationErrors.SelectMany(entityValidationErrors => entityValidationErrors.ValidationErrors))
{
ModelState.AddModelError(string.Empty, error.ErrorMessage);
}
}
}
return View("Create", estimateView);
}