I know this is old, but I am having this same issue now as well. I am grouping by a foreign key, and even tried adding a default value. However, it still creates a new group (the new group is using the default value, which is an existing group, also odd...) and when I click cancel on the pop up editor, the new group and new row persist. Any help or insight would be greatly appreciated!! I was asked to add this property/foreign key specifically for grouping, so I need to get this right.
Here is my model:
public class RV_ReportViewModel { [ScaffoldColumn(false)] public int ReportId { get; set; } [DisplayName("Report Name")] public string ReportName { get; set; } [DisplayName("Report Path")] public string ReportPath { get; set; } [UIHint("GridForeignKey")] public int CategoryId { get; set; } public List<RV_ReportGroupsViewModel> Groups { get; set; } }Here is the code for my grid.
@(Html.Kendo().Grid<RV_ReportViewModel>() .Name("gridReports") .Columns(columns => { columns.Bound(r => r.ReportName).Groupable(false); columns.Bound(r => r.ReportPath).Groupable(false); columns.ForeignKey(r => r.CategoryId,(System.Collections.IEnumerable)ViewData["categories"],"CategoryId","Name"); columns.Command(command => { command.Edit(); command.Destroy(); }).Width(250); }) .ClientDetailTemplateId("template") .ToolBar(toolbar => toolbar.Create()) .Editable(editable => editable.Mode(GridEditMode.PopUp)) .Pageable() .Sortable() .Filterable() .Groupable() .DataSource(dataSource => dataSource .Ajax() .PageSize(10) .Model(model => { model.Id(s => s.ReportId); model.Field(s => s.CategoryId).DefaultValue(1); }) .Create(update => update.Action("Report_Create", "ReportViewer")) .Read(read => read.Action("Report_Read", "ReportViewer")) .Update(update => update.Action("Report_Update", "ReportViewer")) .Destroy(update => update.Action("Report_Destroy", "ReportViewer"))))