How to pass dynamic variable inside ng-repeat

I have an array which has name with current id inside my function:

$scope.expand = function(hodid, supid, leader_id, staff_id, importance){
  var tr_id = 'expand_tree_'+hodid;

In console output it will look like this: expand_tree_1000321 That's how my array will look in the end:

  $scope[tr_id] = {firstLevel:[$scope.firstLevelLst], secondLevel:[$scope.secondLevelLst], thirdLevel:[data_third]};
};

Now I want to print this $scope[tr_id] inside ng-repeat where tAttrs.treeid is id of the selected user:

<div  ng-repeat="first in ['expand_tree_'+tAttrs.treeid].firstLevel['0']">
  {{first.username}}
</div>

But it doesnt print anything. How can I print scope array inside ng-repeat with dynamic variable?

Solution

First, it looks like you are using $scope as your data object. This is not good for a couple reasons. Use an object on the scope instead like:

$scope.data = {};

And store the data like:

$scope.data[tr_id] = {
    firstLevel: [$scope.firstLevelLst],
    secondLevel: [$scope.secondLevelLst],
    thirdLevel: [data_third]
};

But don't wrap the properties in an array, since they are already arrays:

$scope.data[tr_id] = {
    firstLevel: $scope.firstLevelLst,
    secondLevel: $scope.secondLevelLst,
    thirdLevel: data_third
};

Then you can loop through first like:

<div ng-repeat="first in data['expand_tree_' + tAttrs.treeid].firstLevel">
    {{first.username}}<br />
</div>