Conditional HTML - angularjs

Question

I have this very simple ng-repeat that creates accordions. I removed the in class from it so they are closed. But what I actually want it to open the first and close all the others.
Any idea how can I do this?
<div ng-repeat="ticket in tickets">
<div class="panel-group" id="accordion{{ticket.TICKET_ID}}">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" data-parent="#accordion{{ticket.TICKET_ID}}" href="#collapse{{ticket.TICKET_ID}}">{{ticket.TICKET_ID}} - {{ticket.TITLE}} ({{ticket.TICKET_STATUS_DESCRIPTION}})</a>
</h4>
</div>
<div id="collapse{{ticket.TICKET_ID}}" class="panel-collapse collapse">
<div class="panel-body">
{{ticket.DESCRIPTION}}
<hr>
<span><b>Contacted by: </b> {{ticket.TICKET_TYPE_DESCRIPTION}}</span><br>
<span><b>Category: </b> {{ticket.TICKET_CATEGORY_DESCRIPTION}}</span><br>
<span><b>Related to: </b> {{ticket.TICKET_TAG_DESCRIPTION}}</span>
</div>
<div class="panel-footer">{{ticket.CREATED_BY}} - {{ticket.CREATION_DATE}}</div>
</div>
</div>
</div>
</div>

Answer 1

You could use ng-class to selectively add the collapse class, which stops the first panel collapsing :
<div id="collapse{{ticket.TICKET_ID}}" class="panel-collapse" ng-class="{ 'collapse': $index !== 0 }">
<div class="panel-body">
...
I've knocked up an example here:
https://codepen.io/anon/pen/NzMexQ?editors=1010