Two models in one view

Question

I have two Models - Ksiazka.cs and Ludzie.cs and I have a View Wypozyczone.cshtml which presents Ludzie.cs.

Ksiazka.cs

    public int Id { get; set; }
    public string Nazwa { get; set; }
    public string Autor { get; set; }
    public int Ilosc { get; set; }

Ludzie.cs

    public int Id { get; set; }
    public int IdKsiazki { get; set; }
    public string Imie { get; set; }
    public string Nazwisko { get; set; }
    public DateTime DataWyporzyczenia { get; set; }
    public DateTime DataOddania { get; set; }

Ksiazka.id = Ludzie.IdKsiazki

I need to get Nazwa answering IdKsiazki.

Controler

public ActionResult Wypozyczone()
    {
        var model = _mojaBaza.Ludzie.ToList();
        return View(model);

My view

 <th>
        @Html.DisplayNameFor(model => model.IdKsiazki) //I want there Nazwa
    </th>
    <th>
        @Html.DisplayNameFor(model => model.Imie)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.Nazwisko)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.DataWyporzyczenia)
    </th>
    <th>
        @Html.DisplayNameFor(model => model.DataOddania)
    </th>

Answer 1

Create another class(some kind of viewmodel) which represents data you want

public class LudzieKsiazka
{
    public Ludzie Ludzie { get; set; }
    public Ksiazka Ksiazka { get; set; }
}

In controller create this "viewmodel"

public ActionResult Wypozyczone()
{
    var model = _mojaBaza.Ludzie.FirstOrDefault();
    var ksiazka = _mojaBaza.Ksiazka.FirstOrDefault(kz => kz.Id = model.IdKsiazki);

    var viewmodel = new LudzieKsiazka { Ludzie = model, Ksiazka = kziazka };

    return View(viewmodel);
}

Then in view use this "viewmodel"

<th>
    @Html.DisplayNameFor(model => model.Ksiazka.Nazwa)
</th>

Answer 2

If you want to use more than a model on your view, please use Tuple :

So your view should be some thing like this

@model Tuple<Ksiazka,Ludzie>
     <th>
        @Html.DisplayNameFor(tuple => tuple.Item1.Nazwa ) //I want there Nazwa
    </th>
    <th>
        @Html.DisplayNameFor(tuple => tuple.Item2.Imie)
    </th>
    <th>
        @Html.DisplayNameFor(tuple => tuple.Item2.Nazwisko)
    </th>
    <th>
        @Html.DisplayNameFor(tuple => tuple.Item2.DataWyporzyczenia)
    </th>
    <th>
        @Html.DisplayNameFor(tuple => tuple.Item2.DataOddania)
    </th>

Answer 3

Even though, in your question, you have indicated 2 models, you do not need two models. Your problem is your current entity model does not have the one-to-one navigational property for the relationship.

Just listen to your code because it is telling you what it needs: Your view is asking for more information from another class so your view needs a model which has info from both of the models you have. In your Ludzie class you need a navigation property so it can hold the information for Ksiazka :

public class Ludzie
{
    // You need this property
    public Ksiazka Ksiazka { get; set; }
}

Then when you load Ludzie , you will have access to Ksiazka . Then in your view you can do this:

// You can access Nazwa
@Html.DisplayNameFor(model => model.Ksiazka.Nazwa) 

You can read more here on navigation properties.