ng repeat动态数据数组不会更新视图

Question

角度代码：

$scope.activitiesmonth = [];
//get array data from server
$scope.getActivityMonth = function(){
var userID = sessionService.get('user');
var matcher = moment().format('YYYY-MM');
$http({
    method: 'POST',
    url:  'getactivitymonth.php',
    data: {
        matcher : $scope.matcher,
        userID : userID
        }
}).success(function (data,status) {
    $scope.activitiesmonth = data;
});
}
//save new data to database and update array
$scope.saveActivity = function(){
var matcher = moment().format('YYYY-MM');
if($scope.activityname == null || $scope.activitytype == null){
    alert("Please complete the form!");
} else {
    var userID = sessionService.get('user');
    var activityId = parseInt($scope.activitiesmonth[$scope.activitiesmonth.length-1].activityID) + 1;
    $scope.obj = {
        0 : activityId.toString(),
        1: $scope.activityname,
        2: $scope.activitytype,
        3: $scope.momentClicked,
        4: $scope.hour,
        5: userID,
        activityFullDate : $scope.momentClicked,
        activityID : activityId.toString(),
        activityName : $scope.activityname,
        activityTime : $scope.hour,
        activitytype : $scope.activitytype,
        userID : userID
    }
    $http({
        method: 'POST',
        url:  'postactivity.php',
        data: {
            activityname : $scope.activityname,
            activitytype : $scope.activitytype,
            date : $scope.momentClicked,
            time : $scope.hour,
            userID : userID
        }
        }).success(function (response, data) {
            $timeout(function() {
                $scope.activitiesmonth.push($scope.obj);
            },500);
        });
            $uibModalInstance.close();
        }
    }

HTML代码：

<div class="header">

<table class="table table-bordered">
    <thead>
        <tr>
            <th id="acadWeekHeader">{{semester}}</th>
            <th id="daysHeader" ng-repeat="day in daysInWeek">
                {{ day }}
            </th>
        </tr>
    </thead>
    <tbody>
        <tr class="days" ng-repeat="week in daysArray">
            <td class="acadWeek" dragula='"second-bag"'>{{weeksArray[$index]}}</td>
            <td id="{{day}}" ng-repeat="day in week track by $index" ng-class="{'greyOut':isNumber(day), 'highlight':isString(day), 'currentDay':isCurrentDay(day)}" ng-click="check(day)" dragula='"second-bag"'>
                <div ng-show="isString(day) == true" id="day">{{day}}</div>
                <div ng-show="isNumber(day) == true" id="day">{{day}}</div>
                <ul class="list-group" ng-repeat="activity in activitiesmonth | filter:filterDate(day) track by $index" ng-switch="activity.activityType" dragula='"second-bag"'>
                    <li class="list-group-item list-group-item-warning" ng-switch-when="Quiz and Exam" id="{{ activity.activityID }}" ng-click="click()">
                        <span clas="trash" ng-click="deleteActivity(activity.activityID, $event)"><i class="fa fa-trash" aria-hidden="true"></i></span>
                        <span class="activitynames">{{activity.activityName}}</span><br>
                        <span class="datetimes">{{activity.activityTime}}</span>
                    </li>
                    <li class="list-group-item list-group-item-danger" ng-switch-when="Assignment Deadline" id="{{ activity.activityID }}" ng-click="click()">
                        <span clas="trash" ng-click="deleteActivity(activity.activityID, $event)"><i class="fa fa-trash" aria-hidden="true"></i></span>
                        <span class="activitynames">{{activity.activityName}}</span><br>
                        <span class="datetimes">{{activity.activityTime}}</span>
                    </li>
                    <li class="list-group-item list-group-item-success" ng-switch-when="CCA Activity" id="{{ activity.activityID }}" ng-click="click()">
                        <span clas="trash" ng-click="deleteActivity(activity.activityID, $event)"><i class="fa fa-trash" aria-hidden="true"></i></span>
                        <span class="activitynames">{{activity.activityName}}</span><br>
                        <span class="datetimes">{{activity.activityTime}}</span>
                    </li>
                    <li class="list-group-item list-group-item-info" ng-switch-when="Leisure Activities and Other" id="{{ activity.activityID }}" ng-click="click()">
                        <span clas="trash" ng-click="deleteActivity(activity.activityID, $event)"><i class="fa fa-trash" aria-hidden="true"></i></span>
                        <span class="activitynames">{{activity.activityName}}</span><br>
                        <span class="datetimes">{{activity.activityTime}}</span>
                    </li>
                </ul>
            </td>
        </tr>
    </tbody>

每次将新数据推送到$ scope.activitiesmonth数组时，我都会尝试更新视图。但它告诉我“$ digest已在进行中”错误。我该怎么做才能更新视图？非常感谢提前！