在向 Firebase 添加对象时设置您自己的密钥 - AngularFire [英] Setting Your Own Key When Adding an Object to Firebase - AngularFire

问题描述

我可以使用以下内容将对象添加到我的 Firebase 数据存储:

I can use the following to add an object to my Firebase data store:

var uniqueId = {
    name: "a name",
    location: "new york"
}
$scope.myItems.$add(uniqueId).then(function(firebaseId){
    // do something on success
}, function(){
    // do something if call fails
});

以上将向我的数据存储中添加一个对象，如果添加成功，则返回 Firebase 生成的 ID.我刚刚添加的对象保存在这个键下.

The above will add an object into my data store and if the add is successful, an ID generated by Firebase is returned. The object I just added is saved under this key.

当我添加到我的数据存储时，有没有办法让我指定密钥名称?

Is there a way for me to specify what the key name is when I add to my data store?

推荐答案

Firebase 中的一切都是一个 URL.

以下面的网址为例.

Everything in Firebase is a URL.

Take the following URL for example.

https://myapp.firebaseio.com/users/

假设我们要在此位置创建一个密钥为 1 的用户作为孩子.我们的 URL 看起来像这样.

Let's say we want to create a user with a key of 1 as a child at this location. Our URL would look like this.

https://myapp.firebaseio.com/users/1

要使用 AngularFire 创建用户，我们可以在 users 节点创建一个引用并调用 $child(1) 来创建对该位置的引用.

To create a user using AngularFire we can create a reference at the users node and call $child(1) to create a reference to that location.

var usersRef = new Firebase('https://myapp.firebaseio.com/users');
var userRef = new Firebase('https://myapp.firebaseio.com/user/1');

$scope.users = $firebase(usersRef);

// these are the same
$scope.userOne = $firebase(userRef);
$scope.userOne = $scope.users.$child(1);

然后我们可以使用 $set 来存储用户在那个位置的值.

Then we can use $set to store the value of the user at that location.

var usersRef = new Firebase('https://myapp.firebaseio.com/users');
$scope.users = $firebase(usersRef);
$scope.users.$child(1).set({
  first: 'Vincent',
  last: 'Van Gough',
  ears: 1
});

在你的情况下是:

var uniqueId = {
    id: 1,
    name: "a name",
    location: "new york"
};
$scope.myItems.$child(uniqueId.id).$set(uniqueId);

请记住，使用 $set 会破坏该位置之前的所有数据.要非破坏性地更新值，请使用 $update.

Remember that using $set will destroy any previous data at that location. To non-destructively update the values use $update.

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