Hennericho Hennericho - 3 years ago 76
ASP.NET (C#) Question

Inserting a row into Relational database table

I am very new to c# and asp.net mvc. I'm building a HR portal for our company where a user can submit a leave form among other things... So I'm using mssql as the database server and using Entity Frame work to communicate with it. I have 3 entities, user (Containing user details), permissions (the user permissions for allowing actions in the app) and then the leave form table (where the leave form details are stored). There is a one to many relationship between user - permission and then a one to many relationship between user-leave. I am not fazed about the permissions as that gets created when the user account is being created.

The problem I am facing is, how do I add a leave form for a specific user? Below is my controller code:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Leave(MasterViewModel model)
{
DocSubViewModel mv = model.DSModel;
int userId = Convert.ToInt32(Session["userID"]);
try
{
using (HrDcpDBContainer db = new HrDcpDBContainer())
{
var leave = db.leaves.Create();
leave.dateFrom = mv.DateFrom;
leave.dateSubmitted = DateTime.Now;
leave.dateTo = mv.DateTo;
leave.nrDays = mv.NrDays;
leave.reason = mv.SpecialLeave;
leave.TLApproval = null;
leave.TLApprovalDate = null;
leave.TLApprovalID = mv.TeamLeaderID;
leave.DMApprovalDate = null;
leave.DMApprovalID = mv.DepManagerID;
leave.DMApproval = null;
leave.type = mv.Type;
leave.user = userId;
db.leaves.Add(leave);
db.SaveChanges();
}
ViewBag.Message = "Leave Form submitted Successfully. You will be redirected shortly...";
return View("result");
}
catch (Exception ex)
{
ViewBag.Message = ex;
//ViewBag.Message = "Leave Form submitted Successfully. You will be redirected shortly...";
return View("result");
}


The problem comes in
leave.user = userId;
. It says:


Cannot implicitly convert int to Portal.Model.user


I can't seem to find out how to do this...

Answer Source

You're telling it to put the UserId where your leave model is asking for a User.

Your relationship requires a User to go in there, so you'll have to update your code a little bit:

using (HrDcpDBContainer db = new HrDcpDBContainer())
{
    var leave = db.leaves.Create();
    leave.user = db.users.First(x => x.Id == userId);
}

This will put reference to the actual user in the new leave record. If you go later and check it out you'll see a column in the leave table called user_Id that has an integer value in it and is set as a foreign key to the users table.

Note that this will error if no user exists having the specified Id value. If you anticipate this to be a problem, rather use .FirstOrDefault() instead of .First() and then account for the value being null before you add it to your new leave object.

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