I had a kendo grid that used popup edit mode. On the popup editor template had a typical Razor @Html.EditorFor(model => model.fk_DrugBrandID)
When editing/adding a record, the editor correctly showed a drop down list of items, but on save, it was not updating the model. Spent hours trying to figure it out, then realized I had encountered this before. It is because the grid does not handle nullable foreign keys! The solution is to use the Save Event of the grid to something like this:
//grid doesn't handle nullable foreign keys, this passes the value to the controller
function tvyascoSave(e) {
/*alert('saving: ' + e.model.fk_DrugBrandID);*/
if (!e.model.fk_DrugBrandID) {
//change the model value
e.model.fk_DrugBrandID = 0;
//get the currently selected value from the DDL
var currentlySelectedValue = $(e.container.find('[data-role=dropdownlist]')[0]).data().kendoDropDownList.value();
//set the value to the model
e.model.set('fk_fk_DrugBrandID', currentlySelectedValue);
}
}