如何在Firestore中存储二叉树节点 [英] How store binary tree nodes in firestore

问题描述

我想在react中创建一个二叉树.我正在使用 react-d3-tree 组件来显示树. 对于 react-d3-tree ，数据的格式应为

I want to create a binary tree in react.I am using react-d3-tree component for displaying the tree. For react-d3-tree the data should be of the format

const myTreeData = [
  {
    name: 'Top Level',
    attributes: {
      keyA: 'val A',
      keyB: 'val B',
      keyC: 'val C',
    },
    children: [
      {
        name: 'Level 2: A',
        attributes: {
          keyA: 'val A',
          keyB: 'val B',
          keyC: 'val C',
        },
      },
      {
        name: 'Level 2: B',
      },
    ],
  },
];

如何在firestore上存储数据，以便我可以将其检索为上述数组格式?

How to store data on firestore so that I can retrieve it and get it as the above array format?

推荐答案

您只需传递封装在对象中的myTreeData变量，如下所示:

You just have to pass your myTreeData variable encapsulated in an object, as follows:

const db = firebase.firestore();

const myTreeData = [
  {
    name: 'Top Level',
    attributes: {
      keyA: 'val A',
      keyB: 'val B',
      keyC: 'val C',
    },
    children: [
      {
        name: 'Level 2: A',
        attributes: {
          keyA: 'val A',
          keyB: 'val B',
          keyC: 'val C',
        },
      },
      {
        name: 'Level 2: B',
      },
    ],
  },
];

db.collection('yourCollection').add({tree: myTreeData})
.then(function(newDocRef) {
    return newDocRef.get();
}).then(function(doc) {
    console.log("JavaScript Object:", doc.data().tree);
    console.log("JSON:", JSON.stringify(doc.data().tree));
}).catch(function(error) {
    console.log("Error getting document:", error);
});

---

上面的代码将{tree: myTreeData}对象保存在Firestore文档中并取回该文档，以便在控制台中记录tree字段的值(作为JavaScript对象和JSON)

---

The above code saves the {tree: myTreeData} object in a Firestore document and gets back this document in order to log the value of the tree field in the console (as a JavaScript Object and as a JSON)

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