ASP.NET MVC 2 RC Validation problem

Question

I am trying to use the validation capability of ASP.NET MVC 2 (RC)

I have a

viewmodel

public class CategoryPageViewModel
{

            public int Id { get; set; }

            [Required(ErrorMessage="Category name required")]
            public string CategoryName { get; set; }
}

action

    [HttpPost()]
    public ActionResult Create(CategoryPageViewModel categoryModel)
    {
        if (ModelState.IsValid)
        {
            return View("Completed");
        }
        return View(categoryModel);

    }

view

<%= Html.ValidationSummary() %>

<% using (Html.BeginForm("Create", "Category", FormMethod.Post)) {%>

    <fieldset>
        <legend>Create new category</legend>
        <p>
            <label for="CategoryName">Category name:</label>
            <%= Html.TextBox("CategoryName") %>
            <%= Html.ValidationMessage("CategoryName", "*")%>
        </p>

        <p class="submit">
            <input type="submit" value="Create" />
        </p>
    </fieldset>

<% } %>

On submit it says the id field is also required but I have not set the Required attribute.

What am I doing wrong or is it a bug? This is the RC release downloaded today 26/12/09.

Answer 1

If you don't want to pass in the Id, make it nullable ... i.e.:

public class CategoryPageViewModel
{
            public int? Id { get; set; }

            [Required(ErrorMessage="Category name required")]
            public string CategoryName { get; set; }
}

or don't include it at all. How do you expect to perform any type of database update without an ID though?