Grid with list count property column

@(Html.Awe().Grid("Grid1")
    .Columns(
        new Column { Bind = "Id", Width = 75, Groupable = false, Resizable = false },
        new Column { Bind = "Person" },
        new Column { Bind = "Food.Name", ClientFormatFunc = "site.imgFood", MinWidth = 200 },
        new Column { Bind = "MealsCount" },
        new Column { Bind = "MealsCount", Prop = "MealsStr", Header = "Meals"},
        new Column { Bind = "Location" })
    .Url(Url.Action("GetItems"))
    .Height(350)
    .Reorderable()
    .Resizable())

public class GridWithListCountColumnController : Controller
{
    private readonly MyContext mcx = new MyContext();// mock EF Db context

    public GridWithListCountColumnController()
    {
        
    }

    public IActionResult Index()
    {
        return View();
    }

    public async Task<IActionResult> GetItems(GridParams g)
    {
        var query = mcx.Lunches
            .Include(o => o.Food)
            .Include(o => o.Country)
            .Include(o => o.Meals)
            .AsQueryable();

        var gmb = new GridModelBuilder<Lunch>(query, g)
        {
            KeyProp = o => o.Id,// needed for Entity Framework | nesting | tree | api
            Map = o => new
            {
                o.Id,
                o.Person,
                FoodName = o.Food.Name,
                FoodPic = o.Food.Pic,
                o.Location,
                o.Price,
                o.MealsCount,
                MealsStr = string.Join(", ", o.Meals.Select(m => m.Name))
            },
            OrderByFunc = (lunches, rules) =>
            {
                lunches = Dlinq.OrderBy(lunches, rules, new Dictionary<string, LambdaExpression>
                {
                    { "MealsCount", ExprHelper.GetCountLambda<Lunch>(o => o.Meals) }
                });

                return lunches;
            }
        };

        return Json(await gmb.EFBuildAsync());

        // setting OrderByFunc in this demo is actually unnecessary because we're not using Entity Framework
        // and we have Lunch.MealCount property that returns the count,
        // but EF won't be able to translate OrderBy MealCount into a sql query
    }
}