如何操作Firebase快照数据 [英] How to manipulate firebase snapshot data
本文介绍了如何操作Firebase快照数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图了解如何删除快照内的节点.我看过其他示例，但删除后未找到任何内容.
I am trying to understand how to delete a node inside a snapshot. I have looked at other examples but I did not find something on deleting.
这就是JSON的样子
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我需要遍历嵌套产品数组并删除具有空ID的任何元素.我尝试了一些不同的方法，但是找不到解决方案.这是我尝试过的最后一次.
I need to loop through the nested products array and delete any element that has an empty id. I have tried some different things but cant find solution. Here is the last thign I tried.
_seriesMaster.forEach((child) => {
if (child.key === 'products') {
child.forEach(x => {
x.val().products.forEach((p, i) => {
if (!p.id) {
x.val().products[i].remove()
}
})
})
}
})
推荐答案
您将其视为数组，因此首先对其进行过滤:
You treat it as an array, so first filter it:
const filteredProducts = x.val().products.filter(p => !p.id)
，然后使用filteredProducts设置节点
and then set the node with filteredProducts
const productUID = x.key;
const path = 'series/products/' + productUID + '/products';
firebase.database().ref(path).set(filteredProducts)
完整解决方案:
_seriesMaster.forEach((child) => {
if (child.key === 'products') {
child.forEach(x => {
const productUID = x.key;
const filteredProducts = x.val().products.filter(p => !p.id)
const path = 'series/products/' + productUID + '/products';
firebase.database().ref(path).set(filteredProducts)
})
}
})
这篇关于如何操作Firebase快照数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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