How to make Twitter Bootstrap button groups work with AngularJS?

Question

I'm trying to create a simple twitter bootstrap button group that allows the user to select one of several options (think radio buttons). I've got it to a point where it's affecting changes on the model, but the "active" state is not properly being set onclick...unless I click it a second time?? I've created a fiddle and the basic markup follows...

<div range="justified"
    model="myModel"
    options="rangeOptions"></div>
<hr/>
<div range="vertical"
    model="myModel"
    options="rangeOptions"></div>
<hr/>

<pre>myModel:{{myModel}}</pre>

<script type="text/ng-template" id="range.tpl.html">
    <div class="btn-group btn-group-{{type}}" data-toggle="buttons">
        <span class="btn btn-lg btn-primary"
            ng-repeat="option in options"
            ng-class="{active:option.id==model.range_id}" <!-- not working?? -->
            ng-click="activate(option.id)">{{option.label}}</span>
    </div>
</script>

function Main($scope) {
    $scope.rangeOptions = [
        {id:1,label:"Agree"},
        {id:2,label:"Neutral"},
        {id:3,label:"Disagree"}
    ];
    $scope.myModel = {range_id: 2};
}
angular
    .module('range', [])
    .directive('range', function () {
        return {
            replace: true,
            scope: { type:'@range', model:'=', options:'=' },
            templateUrl:'range.tpl.html',
            controller: function ($scope,$element,$attrs) {
                $scope.activate = function (option) {
                    $event.preventDefault();
                };
            }
        };
    });

Answer 1

You don't need 90% bootstrap js to get things like this to work all you need to do is make a button group and attach some ng-clicks to it and ng-class to it:

function myscope($scope) {
  $scope.button = 'red';
}

<div class="btn-group">
    <a href="javascript:void(0)" ng-click="button = 'red'" ng-class="{ 'active' : button == 'red' }" class="btn">red</a>
    <a href="javascript:void(0)" ng-click="button = 'blue'" ng-class="{ 'active' : button == 'blue' }" class="btn">blue</a>
    <a href="javascript:void(0)" ng-click="button = 'green'" ng-class="{ 'active' : button == 'green' }" class="btn">green</a>
</div>

Answer 2

There is some additional info here on making your button group work as radio buttons.

http://getbootstrap.com/javascript/#buttons

Using that info, I forked your Fiddle and this appears to be working.

http://jsfiddle.net/puatj/

The change was just to switch your span element to a label/input.

<div class="btn-group btn-group-{{type}}" data-toggle="buttons">
    <label class="btn btn-lg btn-primary"
        ng-repeat="option in options"
        ng-class="{active:option.id==model.range_id}"
    ng-click="activate(option.id)"><input type="radio"></input>{{option.label}}</label>
</div>