Entity Framework: Unable to determine the principal end of the relationship. Multiple added entities may have the same primary key - sql-server

Question

I'm getting this error while updating the model I'm sharing my code, please tell me the best solution for this.
Ticket Detail Class:
public class TicketDetail
{
[Key]
public int TicketDetailId { get; set; }
public int GenericOrderId { get; set; }
public int PartId { get; set; }
public int Quantity { get; set; }
public decimal? CustomerPrice { get; set; }
public string Status { get; set; }
[Timestamp]
public byte[] RowVersion { get; set; }
public virtual Part Part { get; set; }
public virtual Ticket Ticket { get; set; }
}
OrderDetailClass:
public class OrderDetail
{
[Key]
public int OrderDetailId { get; set; }
public int GenericOrderId { get; set; }
public int PartId { get; set; }
public int Quantity { get; set; }
public decimal? UnitPrice { get; set; }
public string Status { get; set; }
[Timestamp]
public byte[] RowVersion { get; set; }
public virtual Part Part { get; set; }
public virtual Order Order { get; set; }
}
Order Class:
public class Order : GenericOrder
{
public virtual ICollection<OrderDetail> OrderDetails { get; set; }
}
Ticket Class
public class Ticket : GenericOrder
{
public virtual ICollection<TicketDetail> TicketDetails { get; set; }
}
GenericOrderClass:
public abstract class GenericOrder
{
[Key]
public int GenericOrderId { get; set; }
public string ProcessId { get; set; }
public DateTime Date { get; set; }
public string FullName { get; set; }
public string Email { get; set; }
public string Company { get; set; }
public string Phone { get; set; }
public string Message { get; set; }
public decimal Total { get; set; }
[Timestamp]
public byte[] RowVersion { get; set; }
}
and this is the controller class code
TryUpdateModel(order);
TryUpdateModel(ticket);
try
{
order.Date = DateTime.Now;
ticket.Date = DateTime.Now;
order.ProcessId = DateTime.Now.Ticks.ToString().Substring(12, 6);
ticket.ProcessId = order.ProcessId;
//Add the Order
storeDB.Orders.Add(order);
storeDB.Tickets.Add(ticket);
//Process the order
cart.CreateOrder(order);
cart.CreateTicket(ticket);
// Save all changes
storeDB.SaveChanges();
//return RedirectToAction("Complete",
// new { id = order.QuoteOrderId });
TempData["OrderSuccess"] = "Your order has been submitted successfully with the Process ID " + order.ProcessId;
TempData["OrderId"] = order.GenericOrderId;
TempData["Email"] = order.Email;
return RedirectToAction("Confirm");
}
catch (Exception e)
{
//Invalid - redisplay with errors
ModelState.AddModelError("", e.Message);
return View(order);
}
I have searched internet but couldn't find any solution.

Answer 1

Try saving Order and Ticket and after they are saved add Details to them.