Pass Foreign Key via Post Form - asp.net-mvc

Question

I am doing an exercise of creating an helpdesk system. I'm using code first so i create some scripts that i'll describe briefly.
This class is my main class
public class Ticket
{
public int Id { get; set; }
[Required]
[StringLength(255)]
public string Name { get; set; }
[Required]
[Display(Name = "Descrição")]
public string Description { get; set; }
public TicketStatus TicketStatus { get; set; }
public byte TicketStatusId { get; set; }
}
and i created this class to handle ticket answer with an fk to a ticket
public class TicketAnswer
{
public int Id { get; set; }
public Ticket Ticket { get; set; }
public int TicketId { get; set; }
public string Message { get; set; }
}
To create my form i created a viewmodel to handle all ticket answers
public class AnswerTicketViewModel
{
//public IEnumerable<TicketStatus> TicketStatus { get; set; }
public Ticket Ticket { get; set; }
public List<TicketAnswer> TicketAnswer { get; set; }
public string Message { get; set; }
}
and passing this form
#using (Html.BeginForm("SaveAnswer", "Ticket"))
{
#Html.AntiForgeryToken()
#Html.HiddenFor(model => model.Ticket.Id)
<div class="form-group">
#Html.LabelFor(model => model.Message, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.TextAreaFor(model => model.Message, 10, 50, new { htmlAttributes = new { #readonly = "readonly", disabled = "disabled", #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Message, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Enviar Resposta" class="btn btn-default" />
</div>
</div>
}
this is the action
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult SaveAnswer(TicketAnswer ticket)
{
if (!ModelState.IsValid)
{
var ticketStatus = _context.TicketStatus.ToList();
var ticketAnswer = _context.TicketAnswer.Where(t => t.TicketId == ticket.Ticket.Id).ToList();
var viewModel = new AnswerTicketViewModel
{
Ticket = ticket.Ticket,
TicketAnswer = ticketAnswer
};
return View("AnswerTicketForm", viewModel);
}
_context.TicketAnswer.Add(ticket);
_context.SaveChanges();
return RedirectToAction("Index", "Ticket");
}
I'm getting an error "The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo_TicketAnswers_dbo_Tickets_TicketId" how i change that and handle this fk? I try all kinds of solution can someone give a tip?

Answer 1

Got it guys on my viewmodel i put a variable that i set on the form to the id of the ticket and it persists on the post method
public class AnswerTicketViewModel
{
//public IEnumerable<TicketStatus> TicketStatus { get; set; }
public Ticket Ticket { get; set; }
public int TicketId { get; set; }
public List<TicketAnswer> OtherAnswers { get; set; }
public TicketAnswer TicketAnswer { get; set; }
}
#Html.HiddenFor(model => model.TicketId, new { Value=Model.Ticket.Id })
So i was able to handle the database with that foreign key, thanks guys