Angularjs smart-table not sorting $index table cells - angularjs

Question

I have a problem withe the Smart Table AngularJS Sorting, I implemented this on my table as:
The initialized app:
angular.module('myproyApp', ['smart-table'])
The controller side:
$scope.dataList = []; //any json collection with: id, name and description
The view side with st-table directive:
<table class="table table-bordered table-striped" st-table="dataRows" st-safe-src="dataList">
<thead>
<tr>
<th><span class="glyphicon"></span>Q</th>
<th st-sort="name">Name</th>
<th st-sort="descripcion">Description</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
<tr ng-repeat="row in dataRows">
<td class="col-md-1">{{$index + 1}}</td>
<td class="col-md-4">{{row.name}}</td>
<td class="col-md-4">{{row.description}}</td>
<td>Change</td>
</tr>
</tbody>
</table>
On click the sorting header's cells the table is sorting, but the sorting isn't working for the $index cells. Please if you have any think to include the $index cells to sort. I want not to use the indexes on dataList $scope values, I need that this index will be include only on table view.

Answer 1

Track by is used to link your data with the DOM generation made by ng-repeat. When you add track by you tell angular to generate a single DOM element per data object in the given collection. Because $index has to do with the DOM there is no way to have it relate to a particular data entry. Here's a more detailed explanation.
If you really want to do it without touching your dataList, you could call indexOf in your table:
<tbody>
<tr ng-repeat="row in dataList | orderBy:sortField">
<td class="col-md-1">{{dataRows.indexOf(row)}}</td>
<td class="col-md-4">{{row.name}}</td>
<td class="col-md-4">{{row.description}}</td>
<td>Change</td>
</tr>
</tbody>
Where there is a scoped variable called sortField which is a string that is the name of the field you wish to sort by. I implemented a similar thing in this plunker, using the smart-tables module. http://plnkr.co/edit/AF90dQ
I would advise against this because it quickly becomes expensive for large arrays, and runs into problems if your entries aren't unique.