AngularFire - $ firebaseArray可以添加$，但不读 [英] AngularFire - $firebaseArray can $add but not read

问题描述

我觉得我必须失去了一些非常基本的。这是我服务的一部分：

I feel like I must be missing something very basic. Here is a portion of my service:

angular.module('fire')
  .constant('FIREBASE_URI', 'https://___.firebaseio.com/')

  .factory('syncArraySvc', function(FIREBASE_URI, $firebaseArray) {

    var buildingsUri = FIREBASE_URI + "buildings";
    var buildings = $firebaseArray(new Firebase(buildingsUri));
    console.log(buildings);

    var getBuildings = function() {
      return buildings;
    };
    var addBuilding = function(item) {
      buildings.$add(item);
    };
    return {
      getBuildings: getBuildings,
      addBuilding: addBuilding
    };
  });

在那中间的刚的console.log返回一个空数组。如果我尝试调用 syncArraySvc.getBuildings（）从另一个控制器的功能，我也得到一个空数组。不知怎的， $添加（项目）的作品一样， syncArraySvc.addBuilding（项目）。我缺少什么？

The console.log in the middle of that just returns an empty array. If I try to call the syncArraySvc.getBuildings() function from another controller, I also get an empty array. Somehow, $add(item) works, as does syncArraySvc.addBuilding(item). What am I missing?

推荐答案

其他答案帮助让我在正确的方向。

The other answers helped get me pointed in the right direction.

有$的 API文档C $ C样品似乎并不需要的数据被包裹在一个承诺：

The API documentation has a code sample that doesn't seem to need the data to be wrapped in a promise:

var list = $firebaseArray(new Firebase(URL));
$scope.list = list;

但是，它并指出，你可以使用的 $加载 承诺在加载数据时得到通知。这是我得到了它在我的项目的工作：

However, it does point out that you can use the $loaded promise to be notified when the data is loaded. This is how I got it to work in my project:

syncArraySvc.getBuildings().$loaded(function(data) {
  $scope.buildings = data;
});

我想在一个新的项目复制此，它一贯致力于而不 $加载包装，就像他们在第一个例子说明。这是有道理的我， $加载包装将需要。我不明白它如何能在第一个例子是工作离不开它。

I tried replicating this in a fresh project, and it consistently worked without the $loaded wrapper, like they show in the first example. It makes sense to me that the $loaded wrapper would be required. I don't understand how it could be working in the first example without it.

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