增加投票（在已保存的网址列表中）不起作用

Question

我有一个保存在firebase数据库中的URL列表，我试图在每个网址旁边添加一个计数，以便用户可以喜欢它们。我的$ scope.increase函数尝试用于此目的，但必定有错误，它应该增加点击次数并更新数据库。有人可以帮忙吗？

HTML

<li ng-repeat="url in urls | filter:todoSearch" class="list-item">
          <div class="row">
              <div class="col-md-8 link-col">

                  <a href="{{url.title}}" class="link">
                      <p class="title">{{url.name}}</p>
                      <p class="url">{{url.title}}</p>

                  </a>
                    <p ng-model="mvLikes" ng-click="increase($index)">0</p>
              </div>

        </div>
        </li>

JS

var urlFire = angular.module("UrlFire", ["firebase"]);
function MainController($scope, $firebase) {
  $scope.favUrls = $firebase(new Firebase('https://lloydyapp.firebaseio.com/'));
  $scope.urls = [];
  $scope.favUrls.$on('value', function() {
      $scope.urls = [];
      var mvs = $scope.favUrls.$getIndex();
        for (var i = 0; i < mvs.length; i++) {
          $scope.urls.unshift({
            name: $scope.favUrls[mvs[i]].name,
            title: $scope.favUrls[mvs[i]].title,
            likes: $scope.favUrls[mvs[i]].likes,
            key: mvs[i]
          });
        };
    });

$scope.increase = function(index) {
    $scope.mvLikes += 1;
    var mvLikes  = $scope.mvLikes;

    var mv = $scope.urls[index];
    var updateUrlRef = buildEndPoint(mv.key, $firebase);
    updateUrlRef.$set({
      likes: mvLikes
    });

}

....
function buildEndPoint(key, $firebase) {
return $firebase(new Firebase('https://lloydyapp.firebaseio.com/' + key));
}