Remote ViewModel validation of nested objects not working

Question

I have a class user which looks like this:

public class User
{
    public int UserId { get; set; }

    [Required(ErrorMessage = \"A username is required.\")         


        

Answer 1

Inheritance seems like a standard way of adding functionality in this case. How about having your RegistrationViewModel derive from the UserViewModel:

public class RegistrationViewModel : UserViewModel
{
    [DisplayName("Password confirmation")]
    [Required]
    [Compare("Password", ErrorMessage = "The password do not match")]
    public string PasswordConfirmation { get; set; }
}

and:

public ActionResult UsernameExists(string Username)
{
   ...
}