Angularjs 我想通过像SQL WHERE一样使用更新firebase中的特定字段

所以我有这个json数据

"User" : 
[{
    "Description" : "I loved to travel especially to countries such as Japan, Malaysia and Singapore",
    "FirstName" : "Josh",
    "LastName" : "Soh",
    "UserID" : "123"
}]

我想更新FirstName和LastName的字段，但似乎无法更新

我想做一些类似于更新UserID=123的用户的事情

   $scope.edit = function (username,firstname,lastname) {
     var postData = {
            FirstName:firstname,
            LastName:lastname
        };


        var query = firebase.database().ref().child('User').push().key;

        console.log(query.toString());

        var updates = {};
        updates['/User/0/' + query] = postData;

        firebase.database().ref().update(updates);
}

---

修改JSON数据，如下所示

{
    "user" : {
        "2p4OmQqCdCbZzUMLC2BhMJK83jU2" : {
            "Description" : "I loved to travel especially to countries such as Japan, Malaysia and Singapore",
            "FirstName" : "Josh",
            "LastName" : "Soh"
        }
    }
}

然后，要更新数据，可以使用以下代码

firebase.database().ref('user/' + user.uid).update({
    "Description": "I loved to travel especially to countries such as Japan, Malaysia and Singapore",
    "FirstName": "Josh",
    "LastName": "Soh"
});

---

您确定firebase中的数据结构吗？在firebase中，它应该是一个json对象，在我上次检查时不支持数组结构。