How would I pass object to viewModel with specific property?

Question

Im currently trying to make a deck builder. I want the Deck form to show certain cards that a single user has and not the total list of all cards in database. I currently have a drop down list of all cards in the database the cards have another property to it that has the UsersId when it was added to the collection. I want the drop down list to on pull ones with that users Id.

Here is the controllers action. I'm assuming what I need to do is right here where I get the whole list of cards.

public ActionResult New()
        {
            var cards = _context.Cards.ToList();
            var viewModel = new DeckFormViewModel
            {
               Cards = cards
            };
            return View("DeckForm", viewModel);
        }

Here is the form.

@using (@Html.BeginForm("AddCard", "Deck"))
{
    <div class="form-group">
        @Html.LabelFor(m => m.Deck.CardsId)
        @Html.DropDownListFor(m => m.Deck.CardsId, new SelectList(Model.Cards, "Id", "Name"), "Choose Card", new { @class = "form-control" },  )
    </div>
}

This just shows every card added to database regardless of the userId

Answer 1

You're telling it to get all of the cards:

_context.Cards.ToList()

_context.Cards refers to the Cards table. It will load the whole table unless you tell it otherwise.

To filter, use .Where(), for example:

var cards = _context.Cards.Where(c => c.UserId == userId).ToList();

This assumes there's a column in the Cards table called UserId, and that you have a variable called userId with the current user's username.

There more information about querying data using Entity Framework here: Querying Data