MVC3 Html.EditorFor isn't rendering a single thing in my View

public class RegisterViewModel
{
    //Plain POCO Properties
    public RegisterModel RegisterModel { get; set; }

    //Meant to be used in SelectLists.
    public IEnumerable<CityModel> Cities { get; set; }
    public IEnumerable<CountryModel> Countries { get; set; }
}

Here are those classes:

public class RegisterModel
{
    [Required]
    [Display(Name = "Usuario")]
    public string UserName { get; set; }

    [Required]
    [DataType(DataType.EmailAddress)]
    [Display(Name = "Correo")]
    public string Email { get; set; }

    [Required]
    [StringLength(100, ErrorMessage = "Su {0} debe tener al menos {2} caracteres.", MinimumLength = 6)]
    [DataType(DataType.Password)]
    [Display(Name = "Contraseña")]
    public string Password { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Confirme Su Contraseña")]
    [Compare("Password", ErrorMessage = "Sus contraseñas no son las mismas.")]
    public string ConfirmPassword { get; set; }

    [Required]
    [Display(Name = "Nombre")]
    public string Nombre { get; set; }

    [Required]
    [Display(Name = "Apellido")]
    public string Apellido { get; set; }

    [Required]
    [Display(Name = "Direccion")]
    public string Address { get; set; }

    [Required]
    [Display(Name = "Telefono Fijo")]
    public string Telephone { get; set; }

    [Required]
    [Display(Name = "Celular")]
    public string MobilePhone { get; set; }

    [Required]
    [Display(Name = "Fecha de Nacimiento")]
    public DateTime DateOfBirth { get; set; }

    [Required]
    [Display(Name = "Soy:")]
    public bool Sex { get; set; }

    [Required]
    [Display(Name = "Carnet")]
    public int Carnet { get; set; }
}

public class CityModel
{
    [HiddenInput(DisplayValue = false)]
    public int CityId { get; set; }

    [Required]
    [Display(Name = "Ciudad")]
    public string Name { get; set; }      
}

public class CountryModel
{
    [HiddenInput(DisplayValue = false)]
    public int CountryId { get; set; }

    [Required]
    [Display(Name = "Pais")]
    public string Name { get; set; } 
}

And here's how I call the RegisterViewModel in my view:

@model Foodiggly.WebUI.Models.RegisterViewModel

@using (Html.BeginForm()) {
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>RegisterViewModel</legend>

        @Html.EditorForModel()

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

Is this error caused because my ViewModel doens't have any annotations itself? Where can I formally read about this? All I've managed to find online is the occassional blog or two but they online mention simple models, not ones that have a relationship with other objects such as this. A typical foreign key country to person relationship.

Any ideas?

Solution

The view model RegisterViewModel doesn't have any "simple" properties and the MVC framework doesn't render complex properties unless we tell it how to render those. We have to create display templates for DisplayFor and editor template for EditorFor helpers. Check the ASP.NET MVC 2 Templates for details. Another link.

Place your EditorTemplates in folders

~/Views/Shared/EditorTemplates
or
~/Views/ControlerName/EditorTemplates

RegisterModel.cshtml

@model RegisterModel

@Html.LabelFor(model => model.UserName)
@Html.EditorFor(model => model.UserName)

@Html.LabelFor(model => model.Email)
@Html.EditorFor(model => model.Email)

...
...

CityModel.cshtml

@model CityModel

@Html.LabelFor(model => model.CityId)
@Html.EditorFor(model => model.CityId)

@Html.LabelFor(model => model.Name)
@Html.EditorFor(model => model.Name)

CountryModel.cshtml

@model CountryModel

@Html.LabelFor(model => model.CountryId)
@Html.EditorFor(model => model.CountryId)

@Html.LabelFor(model => model.Name)
@Html.EditorFor(model => model.Name)