angual1 ng对父级ng init中返回的异步项重复

我正在努力 <ng-repeat> 在父元素中返回的项上' ng-init . 我觉得 ng初始化 初始化此数组将导致 ng-repeat 不渲染。这是我的HTML/角度设置

<span ng-click=\"showArtist(song.artist.key)\" class=\"song_alias\" 
ng-init=\"collabSongs = getSongsFromCollab(song.collaboration_id); \" >
   {{song.artist.alias}}
   <span ng-repeat=\"songItem in collabSongs\" 
     ng-init=\"songCollabItem = songForKey(songItem); index = $index\">
      {{index != (collabSongs.length - 1) ? songCollabItem.artist.alias : 'goo'}}
   </span>
</span>

但是,即使我注销了它 getSongsFromCollab() 正确返回一个非零元素数组(2),尽管是异步的,但我没有看到内部 <span> 曾经在DOM中呈现过,现在只看到:

<!-- ngRepeat: songItem in collabSongs -->

这里有一个firebase调用函数,用于填充父级的collabsong ng初始化

    $scope.getSongsFromCollab = function(collaboration) {
  console.log('getSongs' , collaboration);
  var songsRef =  new Firebase(FBURL + 'collaboration_songs').child(collaboration).child('songs');
  songsRef.once("value", function(data){
      var val = data.val();
      var array_of_songs = [];
      var keys = Object.keys(val);
      for (var i= 0; i<keys.length; i++){
        array_of_songs.push(val[keys[i]]);
      }
      console.log(array_of_songs);
      return array_of_songs;
  });

};

请注意,我正在注销数组,因此当我获得上述行为时,我已经确认它具有所需的数据。