Data annotations MVC3 Required attribute

Question

I have the Model (User) below, I use it to add new users and to update existing users. When I\'m adding a new user it\'s required to enter the user name and the password, a

Answer 1

You should use view models.

Your data annotations would then belong on the view model being passed to the view

public class CreateViewModel
{
  public int ID { get; set; }

  [Display(Name = "Nome do Usuário")]
  [Required(ErrorMessage = "Digite o Nome do Usuário.")]
  public string name { get; set; }

  [Display(Name = "Senha")]
  [Required(ErrorMessage = "Digite a Senha.")]
  public string password { get; set; }
}

and for edit

 public class EditViewModel
    {
      public int ID { get; set; }

      [Display(Name = "Nome do Usuário")]
      [Required(ErrorMessage = "Digite o Nome do Usuário.")]
      public string name { get; set; }

      //perhaps you don't need the password at all in the edit view
    }

Pass these classes to your view(s), not your domain model(User), then, in the controller, map the view model properties back to the model before persisting to your data source.