KendoUI Grid custom groupable object

Question

I am trying to make a grid groupable on columns field but the columns are object.

{
  Gestionnaire : 
     { id: 4, nom:'nomgestionnaire'},
     {..},
      ..
}

I have success for sortable:

columns: [
     field: "Gestionnaire"
     title: "Gestionnaire"
     sortable:                  
         compare: (a,b) =>
               @compareColumnFields(a.Gestionnaire.Nom, b.Gestionnaire.Nom)
]

with @compareColumnFields function is :

if a is b
    return 0
else if a > b
    return 1
else
    return -1

and for groupable?

groupable : ...

Answer 1

For those in the same situation as me , I completely change solution. Instead of making me a function that returns true and false , it giving it the object in full, I just give the string . For my example I give directly a.Gestionnaire.Nom and b.Gestionnaire.Nom, and THEN you can call :

groupable: true

In fact it was obvious.

Answer 2

I think you're wanting to allow the user to actively group columns.

In that case, all you need is:

groupable: true

in the main structure of the grid.

For example:

$('#grid').kendoGrid({ 
    columns: [
        {
            fields: "Guestionaire",
            title: "Guestionaire",
            sortable:
                compare: (a,b) =>
                    @compareColumnFields(a.Guestionaire.Nom, b.Guestionaire.Nom)
         }, 
         {...placeholder for other columns...}
    ],
    groupable: true
});

Kendo has a sample of this at http://dojo.telerik.com/ejehe Ignore the SelectRow and Expand/Collapse stuff and that ought to be the same as what you're trying to accomplish.