让孩子进入AngularFire

Question

我真的不明白我在这里做错了什么。所以我正在做的是尝试获取图片中描述的特定用户的帖子值

为了获得用户帖子，我使用了这个：

app.controller('chatController', ["$scope", 'AuthService', "Auth", "Ref", "$rootScope","$firebaseArray",
    function($scope, AuthService, Auth, Ref, $rootScope, $firebaseArray) {

        console.log(AuthService.User.email)//Gives me correct Email
        console.log(AuthService.User.password)//Gives me correct password
        console.log(AuthService.User.uid)//Gives me correct uid
        console.log(AuthService.User.username)//Gives me correct username

var some = $firebaseArray(Ref.child("Posts").child(AuthService.User.username)); //Why Giving me an error here when i put that child in?
console.log((some))
 var postsFirebase = $firebaseArray(Ref)
                $scope.messages = postsFirebase

        $scope.submit = function() {
            if (!($scope.textValue)) {
                //Checking for empty string
            } else {
                alert($scope.textValue)

                Ref.child("Posts").child(AuthService.User.username).push({ 
                    "Posts": $scope.textValue 
                })



            }

        }
    }
])

当我把孩子放在AuthService.User.username的第9行时，它给我一个错误说：

  

错误：Firebase.child失败：第一个参数是无效路径：＆＃34; null＆＃34;。路径必须是非空字符串，并且不能包含＆＃34;。＆＃34;，＆＃34;＃＆＃34;，＆＃34; $＆＃34;，＆＃34; [＆ ＃34;，或＆＃34;]＆＃34;

我的主要问题是从孩子那里获取数据。三江源 请帮我。三江源！