angular js：模型不按$ scope更新。$ eval，$ timeout和$ scope。$ apply获取$ digest已在进行中错误

Question

app.controller('MainController', ['$scope','forecast','location',function($scope,forecast,location) {

// this will bring data on page load 
forecast.getData(function(data) {
//data bound to scope
    $scope.testData = data;
    });
//this will bring data on user click
  $scope.sendLocation = function(){ 
//Here is the actual call...  just put it on a button click.
   location.save(function(successResult){
     if(successResult.status === 200){
             $scope.$eval( function() {
            //data should bound to scope on user click
            $scope.testData = successResult.data;
            console.log($scope.testData);// successfully log new data to the console
            });
       };
      /* $scope.$apply(); getting $digest already in progress error */ 
       },function(err){
           console.log(err);
   });
}
}]);

问题是当我点击时，虽然控制台记录了所需的数据，但数据没有在DOM上更新。正如在this帖子中所建议的那样，我在我的处理程序底部使用了$ scope。$ apply（）但是得到了错误，我也尝试了$ scope。$ eval和$ timeout，虽然没有给出任何错误但是在同时两者都没有更新模型