[Solved] Model is null in DisplayTemplate for dropdowns in Grid

[Jacques]

Hi,

I implemented a grid of towns (Villes) with inline editing. One of the fields contains dropdowns (server binding) of Regions from which is selected a region. In order to do so, the files ~/Views/DisplayTemplates/cbRegion.cshtml and ~/Views/EditingTemplates/cbRegion.cshtml were created and the model field was decorated with [UIHint("cbRegion"), Required].
There is no problem in edit mode since the dropdown is displayed nicelly.
The problem is in display mode where I get an error message from the DisplayTemplate file (cbRegion.cshtml) :

Object reference not set to an instance of an object.

Line 1:  @model Phare.Models.Region
Line 2: @Model.nom  <- error is here

The Grid definition is as below. Is there a setting or something else that I missed? Why is the model ok in edit mode (EditingTemplate file) and not in display mode? Is'nt the model passed the same way in both files?

Thanks

Grid definition:

@model IEnumerable<Phare.Models.Ville>
@{
    ViewBag.Title = "Villes";
}
<h2> Villes</h2>

@(Html.Telerik().Grid(Model)
    .Name("Grid")
    .ToolBar(commands => commands.Insert())
    .DataKeys(keys => keys.Add(c => c.ID))
    .Columns(columns =>
    {
        columns.Bound(o => o.ID);
        columns.Bound(o => o.nom);
        columns.Bound(o => o.Region); //Region is a complex type object for dropdown
        columns.Bound(o => o.description);
        columns.Command(commands => { commands.Edit(); commands.Delete(); }).Width(200);
    })
    .DataBinding(dataBinding => dataBinding
        .Server()
            .Select("Index", "Ville")
            .Insert("Insert", "Ville")
            .Update("Save", "Ville")
            .Delete("Delete", "Ville"))
    .Scrollable(scrolling => scrolling.Enabled(true))
    .Sortable(sorting => sorting.Enabled(true))
    .Pageable(paging => paging.Enabled(true))
    .Filterable(filtering => filtering.Enabled(true))
    .Groupable(grouping => grouping.Enabled(false))
    .Footer(true)
    .Editable(editing => editing.Mode(GridEditMode.InLine))
)

[Atanas Korchev]

Hello Jacques,

 We are not sure why the model is null in the display template. This can happen only if your grid is not server bound because we don't support display templates in ajax binding mode. Could you provide a sample project so we can check it out locally?

Regards,
Atanas Korchev
the Telerik team

[Jacques]

Hi Atanas,

Here is a sample project reproducing the problem.

[Atanas Korchev]

Hello Jacques,

 I cannot run this sample project because it requires a database which is not present. You can either amend the project so it does not need a database or send a db backup.

Greetings,
Atanas Korchev
the Telerik team

[Jacques]

Sorry Atanas,

 

Here is the SQL Server 2008 Express backup file.

Thanks,

[Atanas Korchev]

Hi Jacques,

 The problem is caused by the fact that there are some models whose Region property is actually null. This of course is not related to Telerik Grid for ASP.NET MVC.

I modified your project so it has a check if model is not null in the partial view.

Kind regards,
Atanas Korchev
the Telerik team

[Jacques]

Thank you Atanas,

 

How did'nt I thought abput that...I will continue to use Telerik ASP.NET MVC grid since it's the best among those I tried latelly.

 

Thanks again,

 

Jacques