Grid inline editing multiple editors in one cell

@{
    var gridId = "DinnersGrid";
}
<div class="bar">
    <div style="float: right;">
        @Html.Awe().TextBox("txtSearch").Placeholder("search...").CssClass("searchtxt")
    </div>
    <button type="button" onclick="$('#@gridId').data('api').inlineCreate()" class="awe-btn mbtn">Create</button>
    @{
        var chefId = Db.Chefs.First().Id;
        var meals = Db.Meals.Take(2).Select(o => o.Id).ToArray();
        var initObj = new { Name = "hi there", Date = DateTime.Now.ToShortDateString(), ChefId = chefId, MealsIds = meals };
    }

    @Html.InlineCreateButtonForGrid(gridId, initObj, "Create with predefined values")
</div>

@Html.InitDeletePopupForGrid(gridId, "GridInlineEditDemo")

@(Html.Awex().Grid<Dinner>(gridId)    
    .Url(Url.Action("GridGetItems"))
    .InlEdit(new InlEditOpt { SaveUrl = Url.Action("Save") })
    .Main()
    .Parent("txtSearch", "search")
    .Height(350)
    .Resizable()
    .Reorderable()
    .Columns(b => {
        b.Add(o => o.Id, new Column { Width = 75 }).InlId();

        b.Add(o => new { o.Name, o.Date }, 
            new Column { Header = "Name" })
            .Inl(Html.Awe().TextBox("Name"))
            .Inl(Html.Awe().DatePicker("Date"));        

        b.Add(o => new { o.Chef.FirstName, o.Chef.LastName }, 
            new Column { Header = "Chef", MinWidth = 200, Grow = .2 })
            .Inl(Html.Awe().Lookup("ChefId").Controller("ChefLookup"), "ChefId");

        b.Add(new Column { ClientFormat = ".(Meals) and .(BonusMeal)", Header = "Meals" })
            .InlMultiselect(new MultiselectOpt { Name = "MealsIds", Url = Url.Action("GetMealsImg", "Data") }.ImgItem())
            .InlDropdownList(new DropdownListOpt { Name = "BonusMealId", Url = Url.Action("GetMealsImg", "Data") }.ImgItem());

        b.Add(o => o.Organic, new Column { Width = 100, Prop = "DispOrganic" })
            .Inl(Html.Awe().Toggle(new ToggleOpt { Name = "Organic" }));

        b.Add(Html.InlEditDelColumn(gridId));        
    }))
<script>
    var meals = @Html.Raw(DemoUtils.Encode(Db.Meals.Select(o => new KeyContent(o.Id, o.Name))));
</script>

using AweCoreDemo.Data;
using AweCoreDemo.Models;
using AweCoreDemo.ViewModels.Input;
using Microsoft.AspNetCore.Mvc;

using Omu.Awem.Utils;
using Omu.AwesomeMvc;

namespace AweCoreDemo.Controllers.Demos.Grid
{
    public class GridInlineEditDemoController : Controller
    {
        public IActionResult GridGetItems(GridParams g, string search)
        {
            var gmb = new GridModelBuilder<Dinner>(Db.Dinners.AsQueryable(), g)
            {
                KeyProp = o => o.Id, // needed for api select, update, tree, nesting, EF
            };

            gmb.FilterContainsStr(o => new { o.Name, o.Chef.FirstName, o.Chef.LastName }, search);

            gmb.Prop(o => o.Organic, "DispOrganic", o => o ? "Yes" : "No");

            // props used for inline editing controls values
            gmb.PropVal(o => o.Meals.Select(m => m.Id), "MealsIds");
            gmb.PropVal(o => o.Chef.Id, "ChefId");
            gmb.PropVal(o => o.BonusMeal.Id, "BonusMealId");

            // for conditional demo
            gmb.Prop(o => o.Meals.Count(), "Editable", count => count > 1);
            gmb.Prop(o => o.Date.Year, "DateReadOnly", year => year < 2015);

            // for multi editors demo
            gmb.PropVal(o => o.Name, "Name");
            gmb.PropVal(o => o.Date, "Date", o => o.ToShortDateString());

            gmb.Prop(o => o.Meals.Select(m => m.Name), "Meals");
            gmb.Prop(o => o.BonusMeal.Name, "BonusMeal");

            return this.AweJson(gmb.Build());
        }

        [HttpPost]
        public IActionResult Save(DinnerInput input)
        {
            // custom validation example
            if (ModelState.IsValid && input.Name.Contains("asdf"))
            {
                ModelState.AddModelError("Name", "Name can't contain asdf");
            }

            if (ModelState.IsValid)
            {
                var isCreate = !input.Id.HasValue;

                var ent = isCreate ? new Dinner() :
                    Db.Dinners.FirstOrDefault(o => o.Id == input.Id);

                if (ent == null)
                {
                    throw new Exception("Item doesn't exist anymore, id:" + input.Id);
                }

                ent.Name = input.Name;
                ent.Date = input.Date.Value;
                ent.Chef = Db.Find<Chef>(input.ChefId);

                // ToList req for EF
                ent.Meals = Db.Meals
                    .Where(o => input.MealsIds.Contains(o.Id)).ToList();

                ent.BonusMeal = Db.Find<Meal>(input.BonusMealId);
                ent.Organic = input.Organic ?? false;

                if (isCreate)
                {
                    Db.Add(ent);
                }

                return Json(new { });
            }

            return Json(ModelState.GetErrorsInline());
        }

        public IActionResult Delete(int id)
        {
            var dinner = Db.Find<Dinner>(id);

            return PartialView(new DeleteConfirmInput
            {
                Id = id,
                Type = "dinner",
                Name = dinner.Name
            });
        }

        [HttpPost]
        public IActionResult Delete(DeleteConfirmInput input)
        {
            Db.Remove(Db.Find<Dinner>(input.Id));

            // the PopupForm's success function aweUtils.itemDeleted expects an obj with "Id" property
            return Json(new { input.Id });
        }

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

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

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

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

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