Arrays 在my cloud函数中运行角度JS映射函数

在我的angular JS web应用程序中，以下功能运行良好：

$firebaseArray(orderedPlayers)
            .$loaded(function(loadedPlayers) {
            var normalizedPlayers = loadedPlayers.reduce(function(acc, next) { acc[next.id] = next; return acc; }, {});
            var selectedPlayers = $scope.selection.map(function(num){
                return normalizedPlayers[num];
            });
            $scope.players = selectedPlayers;

我尝试将he函数转换为我的云函数，如下所示：

snapshot.forEach(function(userSnapshot) {
           var users = userSnapshot.val();
           var selection = users.selection;   
 admin.database().ref("Player").child("playerweek8").once('value')
  .then(function(dataSnapshot) {
      let yourArray = [];
   var orderedPlayers = dataSnapshot.val();
   yourArray.push(orderedPlayers);

 var normalizedPlayers = yourArray.reduce(function(acc, next) { acc[next.id] = next; return acc; }, {});
            var selectedPlayers = selection.map(function(num){
                return normalizedPlayers[num];
            });

            var players = selectedPlayers;

但是，my cloud函数返回错误：“selection.map不是函数”

有没有办法解决这个问题，让云功能像在web应用程序中一样运行

下面是我的数据库json的一个片段，它应该更能理解上述内容：

{
"players" : [
       {"name" : "Yasin 'YB' Amusan", 
        "Team" : "Industry",
        "price": 8000000, 
        "position": "forward", 
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png", 
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Hassan 'Hasi' Akinyera",
        "Team" : "Industry", 
        "price": 5000000, 
        "position": "defender",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0,
        "Y" : 0,
        "R" : 0}],

Users: [{
  "1YrpX2W2xnMPoy4YGpZcOE0xJ5g2" : {
    "email" : "muyiwaawoniyi@hotmail.com",
    "fullname" : "Muyiz",
    "selection" : [ 1, 2, 3, 4, 5, 6 ],
    "teamname" : "Donawon",
    "total" : 12,
    "userName" : "muyiwaawoniyi@hotmail.com",
    "week1" : 0,
    "week10" : 0,
    "week11" : 0,
    "week12" : 0,
    "week2" : 0,
    "week3" : 0,
    "week4" : 0,
    "week5" : 0,
    "week6" : 12,
    "week7" : 0,
    "week8" : 0,
    "week9" : 0
  },
  "6K9rQiZQ3jaV38WWtDbNwxhqIwc2" : {
    "email" : "dami.etomi@gmail.com",
    "fullname" : "Dami Etomi",
    "selection" : 0,
    "teamname" : "Bayern Neverlosin'",
    "total" : 0,
    "userName" : "dami.etomi@gmail.com",
    "week1" : 0,
    "week10" : 0,
    "week11" : 0,
    "week12" : 0,
    "week2" : 0,
    "week3" : 0,
    "week4" : 0,
    "week5" : 0,
    "week6" : 0,
    "week7" : 0,
    "week8" : 0,
    "week9" : 0
  }
]

---

代码中的

选项是什么？这里没有显示。@DougStevenson嘿。我编辑了这个问题来回答这个问题，当你检查它的内容时，什么是
用户
？听起来它的
selection
属性不像你想象的那样。@DougStevenson我对它工作原理的理解是
users
是一个数组，
selection
是
user
数组中每个用户都拥有的一个键。我试图在questionconsole末尾的数据库快照中反映这一点。在试图找出变量中的内容时，log（）是您的朋友。我只能猜到里面有什么。你可以肯定地知道。