Firebase Web update()删除所有其他子节点 [英] Firebase Web update() deletes all other child nodes

问题描述

大家好，我在这里变得很奇怪.当用户单击按钮时，我尝试更新一个特定的子节点.这是我的代码:

Hello everyone I am getting weird behaviour here. I try to update one specific child node, when the user clicks a button. Here is my code:

var updates2 = {};
var offer = {
  minusAccandShare: 2,
}
updates2['/offerLight/' + keyReal] = offer;
updates2['/offer/' + keyReal] = offer;
return firebase.database().ref().update(updates2);

一切正常，更新了正确的节点，但是在更新minusAccandShare时，其他所有内容都会被删除

Everything is working fine the correct nodes are updated but while updating minusAccandShare everything else will be deleted

结构类似于:

offer
  jifdjsiavdas
    minusAccandShare: -6
    offerName: "Replacement"
    offerText: "You have the choice to..."
    ...

它变成

offer
  jifdjsiavdas
    minusAccandShare: 2

我多次使用了这种方法，就像在Firebase指南中描述的那样，它始终像一种魅力一样起作用.但是在那里，我用新的密钥创建了完全新的节点，因此没有什么可以删除.

I used this approach like described in the firebase guides multiple times and it always worked like a charm. But there I created completly new nodes with a new key so there was nothing to be deleted.

谢谢大家:D

推荐答案

代码中实际发生的是以下情况:

What is actually happening in your code is the folowing:

您正在完全写入密钥，从而清除了数据集中的所有属性.

You are writing entirely to the key thereby wiping off the whole properties in your dataset.

此

updates2['/offer/' + keyReal] = offer;

清除该特定密钥中的全部数据.

wipes out the whole data in that particular key.

尝试以下方法:

firebase.database().ref('offer/' + keyReal).update({
    minusAccandShare: 2,
  });

这可让您确保更改Firebase数据集中的指定属性.

this allows you to make sure you change the specified property in your firebase dataset.

我希望这对您有帮助

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