AngularJS: ng-repeat track by $index inside nested loops

Question

I need a second $index for my nested ng-repeat loop. How and where should I put it?

AngularJS site says

Creating aliases for these propertie

Answer 1

$index will refer to the index on the innermost ngRepeat scope, so if that's what you need, you can just use it.

What the docs is describing is a scenario where you need access to $index in the parent ngRepeat. You can get it in a couple of ways: One is to use $parent, and another is to use ngInit, as the Angular docs suggested. Here's an example...

<li ng-repeat="thing in things" ng-init="parentIndex = $index">
    {{ $index }}
    <ul>
        <li ng-repeat="value in thing.values">
            {{ value }} 
            {{ $index }} <!-- inner $index -->
            {{ $parent.$index }} <!-- parent $index -->
            {{ parentIndex }} <!-- also parent $index -->
        </li>
    </ul>
</li>

Fiddle