“The Id field is required” validation message on Create; Id not set to [Required]

Question

This is happening when I try to create the entity using a Create style action in Asp.Net MVC 2.

The POCO has the following properties:

public int Id          


        

Answer 1

I had the same issue and managed to solve it by simply passing an empty instance of the view model to the view during the GET call of my Create method.

//GET: DocumentTypes/{Controller}/Create
    public ActionResult Create()
    {
        return View(new DocumentTypeViewModel());
    }

    //POST: DocumentTypes/{Controller}/Create
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create(DocumentTypeViewModel viewModel)
    {
        if(ModelState.IsValid) {

            var result = AddDocumentType(viewModel);
            if(!result.HasValidationErrors) {
                return RedirectToAction("Index");
            }

            ModelState.Update(result);

        }

        return View(viewModel);
    }

And then in my view, I ensure that I have

@Html.HiddenFor(m => m.ID)

This way I don't have to explicitly specify Bind attributes