Question

I have 5 entity and use the custom model for the three of them but I need the foreign key of other 2 in the model the custom model are as

public class CourierRape
{
    public Sender Sender { get; set; }
    public Receiver Receiver { get; set; }
    public Parcel Parcel { get; set; }
}

The two remaining entities are Country and City

The controller is as follows

public ActionResult Create()
{
        ViewBag.S_City_Id = new SelectList(db.Cities, "Id", "Name");
        ViewBag.S_Country_Id = new SelectList(db.Countries, "Id", "Name");
        ViewBag.R_City_Id = new SelectList(db.Cities, "Id", "Name");
        ViewBag.R_Country_Id = new SelectList(db.Countries, "Id", "Name");

        return View();
} 

//
// POST: /Courier/Create
[HttpPost]
public ActionResult Create(CourierRape c)
{
        ViewBag.S_City_Id = new SelectList(db.Cities, "Id", "Name", c.Sender.S_City_Id);
        ViewBag.S_Country_Id = new SelectList(db.Countries, "Id", "Name", c.Sender.S_Country_Id);
        ViewBag.R_City_Id = new SelectList(db.Cities, "Id", "Name", c.Receiver.R_City_Id);
        ViewBag.R_Country_Id = new SelectList(db.Countries, "Id", "Name", c.Receiver.R_Country_Id);

        try
        {
            SenderController s = new SenderController();
            ReceiverController r = new ReceiverController();
            ParcelController p = new ParcelController();

            r.Create(c.Receiver);
            s.Create(c.Sender);
            c.Parcel.Sender_Id = c.Sender.Id;
            c.Parcel.Receiver_Id = c.Receiver.Id;
            p.Create(c.Parcel);

            return RedirectToAction("Index");
        }
        catch
        {
            ViewBag.Message = c.Sender.S_City_Id.ToString() +" " + c.Receiver.R_City_Id.ToString() + " " + c.Receiver.R_Country_Id.ToString()  + " "+ c.Sender.S_Country_Id.ToString();
            return View(c);
        }

but it throws the exception and return the model with the 0 of the foreign keys

And when I remove the try catch it gives the following error

The INSERT statement conflicted with the FOREIGN KEY constraint “FK_Receiver_Country”. The conflict occurred in database “452171974654368803C496909AE805A3_ENTS\VISUAL STUDIO 2010\PROJECTS\COPY OF ECOMMERCECOURIER\ECOMMERCECOURIER\APP_DATA\COURIER.MDF”, table “dbo.Country”, column ‘Id’.
The statement has been terminated.

Answer 1

Look at the CountryId on the objects you’re creating and make sure they exist in your country table.