IDENTITY_INSERT is set to OFF in MVC application - sql

Question

I am trying to create a new employee in MVC 5. I used CRUD to generate views and models. I edited a few lines of code and I get this error:
Cannot insert explicit value for identity column in table 'Table' when IDENTITY_INSERT is set to OFF.
Where I got this:
public ActionResult Create([Bind(Include = "Imie,Nazwisko,Pesel,Data_zatrudnienia,Data_zwolnienia,Pensja,Wyksztalcenie")] Osoba osoba,Pracownik pracownik)
{
if (ModelState.IsValid)
{
db.Osoba.Add(osoba);
db.Pracownik.Add(pracownik);
db.SaveChanges();
return RedirectToAction("Index");
}
My model class:
public partial class Pracownik
{
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id_osoby { get; set; }
public System.DateTime Data_zatrudnienia { get; set; }
public Nullable<System.DateTime> Data_zwolnienia { get; set; }
public double Pensja { get; set; }
public string Wyksztalcenie { get; set; }
public virtual Osoba Osoba { get; set; }
public virtual Pracownik_biurowy Pracownik_biurowy { get; set; }
public virtual Przewodnik Przewodnik { get; set; }
}
public partial class Osoba
{
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id_osoby { get; set; }
public string Imie { get; set; }
public string Nazwisko { get; set; }
public string Pesel { get; set; }
public virtual Pracownik Pracownik { get; set; }
}
Create form view:
#model BiuroPrototyp.Models.Pracownik
#{
ViewBag.Title = "Create";
}
<h2>Create</h2>
#using (Html.BeginForm())
{
#Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Pracownik</h4>
<hr />
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
<div class="form-group">
#Html.LabelFor(model => model.Osoba.Imie, htmlAttributes: new {#class = "control-label col-md-2"})
<div class="col-md-10">
#Html.EditorFor(model => model.Osoba.Imie, new {htmlAttributes = new {#class = "form-control"}})
#Html.ValidationMessageFor(model => model.Osoba.Imie, "", new {#class = "text-danger"})
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Osoba.Nazwisko, htmlAttributes: new {#class = "control-label col-md-2"})
<div class="col-md-10">
#Html.EditorFor(model => model.Osoba.Nazwisko, new {htmlAttributes = new {#class = "form-control"}})
#Html.ValidationMessageFor(model => model.Osoba.Nazwisko, "", new {#class = "text-danger"})
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Osoba.Pesel, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Osoba.Pesel, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Osoba.Pesel, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Data_zatrudnienia, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Data_zatrudnienia, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Data_zatrudnienia, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Pensja, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Pensja, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Pensja, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.Wyksztalcenie, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Wyksztalcenie, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Wyksztalcenie, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
'Pracownik' class is employee and he is inherits from 'Osoba' which is Person in English. I dont know where I trying to put this id in my code.

Answer 1

You are trying to save an object to the database with an explicit ID set by you while the database is expecting to generate that value itself. That is the Id_osoby property in your object is set to something other than 0 and it is not identified to the EF framework as an identity field. If you want the Id to be generated by the database as your post suggests, then the corresponding property in the Object should be decorated with the [Key] attribute.