Firebase推送 - 删除唯一对象并插入新对象(基本上覆盖内容)

时间:2015-09-14 22:31:21

标签: javascript firebase

我有一个使用firebase运行的应用程序。当我尝试使用push()方法时,它基本上覆盖了现有的JSON。这是一个例子: 第一次,生成以下JSON:

JSON "deviceIDs" : { "-JzCx5C_13eoXPEgklMW" : { "author" : "gracehop22", "deviceID" : "99alpha", "title" : "Announcing COBOL, a New Programming Language" } }

下一次,如果我调用相同的函数,将删除上面的JSON并插入一个新的JSON,如下所示:

JSON "deviceIDs" : { "-JzCxbuEj2V1kmvvgqnc" : { "author" : "gracehop22", "deviceID" : "99alpha", "title" : "Announcing COBOL, a New Programming Language" } }

这是我的代码段:

function CreateUserProfile(UID, name, email, deviceID) {

    var ref = new Firebase($scope.firebaseurl + '/' + UID);
    var profileArray = {UserProfile:{}};
    profileArray.UserProfile.UID = UID;
    profileArray.UserProfile.name = name;
    profileArray.UserProfile.email = email;
    profileArray.UserProfile.deviceID = deviceID;

    var onComplete = function (error) {
        if (error) {
            console.log('Synchronization failed');
        } else {

            //1. On Success, Store Key User Profile Elements
            localStorage.setItem("kasimaProfileInfo",JSON.stringify(profileArray));

            $rootScope.username = name;

            //2. Hide the feedback and change screens
            $timeout(function () {
                $scope.HideFeedback();
                $scope.ChangeLoc('/featured');
            }, 1500);
        }
    };
    ref.set(profileArray, onComplete);


    var postsRef = ref.child("deviceIDs");
    var newPostRef = postsRef.push();
    newPostRef.set({
        deviceID: deviceID,
        author: "gracehop22",
        title: "Announcing COBOL, a New Programming Language"
    });
}

1 个答案:

答案 0 :(得分:1)

当您设置profileArray时,您将覆盖整个参考号:

...
ref.set(profileArray, onComplete);

var postsRef = ref.child("deviceIDs");
...

您可能希望在那里使用update()

...
ref.update(profileArray, onComplete);

var postsRef = ref.child("deviceIDs");
...

更新

Firebase update()函数设置传递它的JSON对象中的属性值。因此,您的新profileArray.UserProfile将替换现有数据。

解决方案是不在本地构建嵌套的JSON结构,而是在需要更新的较低位置更新数据:

ref.child('UserProfile').update(profileArray.UserProfile, onComplete);

这消除了对profileArray

的全部需求
var userProfile = {
  UID: UID,
  name: name,
  email: email,
  decideID: deviceID
};
ref.child('UserProfile').update(userProfile, onComplete);

有关工作示例,请参阅:http://jsbin.com/ciqoge/edit?js,console

下一次:如果您直接提供这样的jsbin / jsfiddle,快速帮助您将会容易得多。