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.

N.N. · Accepted Answer · 2011-11-10 11:48:37Z

3

Your Create method is trying to construct a new CategoryPageViewModel from the posted form collection.

public ActionResult Create(CategoryPageViewModel categoryModel){...}

However, as your form only contains an input for CategoryName, your controller method cannot create a new CategoryPageViewModel where id is required.

You have two solutions to your problem:

Make the Id in CategoryPageViewModel nullable as @Andrew mentioned.
```
public int? Id { get; set; }
```
Recommended Solution: Keep the Id as not nullable, but render this value in your form as a hidden input. This will allow you to keep your system Id intact from controller to view and back again.

In the view add the Id as a hidden input using the following:
```
<%= Html.Hidden("Id") %>
```

edited Nov 10, 2011 at 11:48

N.N.

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answered Nov 9, 2011 at 15:05

steelcm

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Comments

Andrew · Accepted Answer · 2009-12-26 05:55:20Z

0

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?

answered Dec 26, 2009 at 5:55

Andrew

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1 Comment

eb. Over a year ago

Id will be auto generated by db. Id will be required only when editing a category or assigning a category to another related object.

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