“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, except i had three integer fields on my model. I managed to get around it by setting all my integer properties that were erroneously required to nullable ints.

Answer 2

I have the same problem, using RC2 with a POCO. If you name a property Id but do not put an validation attributes on it but IsValid says it is required. If I name a property anything but Id this does not happen. Why should I have to Exclude Id?

Thanks

Answer 3

You can add the attribute:

 [Bind(Exclude = "Id")] 

on the parameter in method rather than the class, that way on create you can exclude it and on edit it will still be mandatory:

public ActionResult Create([Bind(Exclude = "Id")] User u)
{
    // will exclude for create
}

public ActionResult Edit(User u)
{
    // will require for edit
}

Answer 4

You can disable this implicit validation by setting the AddImplicitRequiredAttributeForValueTypes option on the DataAnnotationsModelValidatorProvider by adding the following to your Application_Start:

DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;

Further Reading:

• Unrequired property keeps getting data-val-required attribute
• ASP.NET MVC optional field being treated as required
• Why MVC Model Binder set required for int, long values?

Answer 5

Check in your view. Remove if your have hiddenfieldfor id field. This is used only for editing. @Html.HiddenFor(Model => Model.Id)

Answer 6

[Bind(Exclude = "Id")]
public class Hebe
{
      public int Id {get;set;}

      [Required]
      public string Message {get; set}
}

By the way above it doesnt bind the Id Property for your model on create