【发布时间】：2018-09-08 18:10:47
【问题描述】：
我通过创建应用程序来学习 React，但我认为我低估了它的复杂性。让我与您分享一下我是否正确：
这个想法是创建一个 React 应用程序来跟踪我想学习的主题。我创建了以下结构：
MainTopic:
-- title: String
-- percentage_completed: Number
-- Topic: Array
---- Subtopic: Array
---- title: String
---- percentage_completed: Number
------ Resources: Array
------ title: String
------ link: String
------ completed: Boolean
JSON 结构应如下所示 - 文档由其父级的 _id 压缩：
{
"title": String,
"percentage_completed": Number
"topic":[
{
"title":String,
"percentage_completed":Number
"subtopic":[
{
"title":String
"percentage_completed": Number
"resources":[
{
"title":String
"link": String
"concluded": Boolean
}
]
}
]
}
]
}
每个主题都称为MainTopic，它下面有很多主题，比如：JavaScript有NodeJS、数据结构和算法作为主题，Express是Node的子主题等等……
我有一个 NodeJS API 服务 JSON 来获取已经存储在数据库中的文档的完整列表以及它的每个特定部分，MainTopics，来自给定 MainTopic 的主题等等......这里你是 JSON它返回：
[
{
"topics": [
{
"subtopics": [
{
"resources": [
{
"_id": "5b857b00c346783a24cbdbb5",
"subtopic_id": "5b857ad0c346783a24cbdbb4",
"title": "Udemy Course",
"link": "https://udemy.com/dictionaires-nodejs",
"concluded": false,
"__v": 0
}
],
"_id": "5b857ad0c346783a24cbdbb4",
"title": "Dictionaries",
"percentage_concluded": 0,
"topic_id": "5b857a12c346783a24cbdbae",
"__v": 0
}
],
"_id": "5b857a12c346783a24cbdbae",
"maintopic_id": "5b8565b90c927b2c47df7d9d",
"title": "Node.js",
"percentage_concluded": 0,
"__v": 0
},
{
"subtopics": [
{
"resources": [],
"_id": "5b857ab8c346783a24cbdbb3",
"title": "Lists",
"percentage_concluded": 0,
"topic_id": "5b857a1ac346783a24cbdbaf",
"__v": 0
}
],
"_id": "5b857a1ac346783a24cbdbaf",
"maintopic_id": "5b8565b90c927b2c47df7d9d",
"title": "Java",
"percentage_concluded": 0,
"__v": 0
},
{
"subtopics": [
{
"resources": [
{
"_id": "5b857a91c346783a24cbdbb2",
"subtopic_id": "5b857a6ec346783a24cbdbb1",
"title": "Udemy Course",
"link": "https://udemy.com",
"concluded": false,
"__v": 0
}
],
"_id": "5b857a6ec346783a24cbdbb1",
"title": "Variables",
"percentage_concluded": 0,
"topic_id": "5b857a21c346783a24cbdbb0",
"__v": 0
}
],
"_id": "5b857a21c346783a24cbdbb0",
"maintopic_id": "5b8565b90c927b2c47df7d9d",
"title": "Python",
"percentage_concluded": 0,
"__v": 0
}
],
"_id": "5b8565b90c927b2c47df7d9d",
"title": "Programming Languages",
"percentage_concluded": 30,
"__v": 0
}
]
我想启动 React 部分，但我真的不知道如何构建它，我的意思是，我应该创建 1 个组件来处理请求的全部数据量，还是应该为每个移动部分创建一个组件？比如...一个用于 MainTopics 的组件，一个用于 Topics，一个用于 SubTopics，一个用于每个 Resource。
到目前为止，我有以下 Reac 代码：
App.js
components/
Learning.js
Resource.js
Header.js
主应用文件App.js
import React, { Component } from 'react';
import Header from './components/Header';
import 'bootstrap/dist/css/bootstrap.min.css';
import './App.css';
import Learning from './components/Learning';
import './index.css';
class App extends Component {
render() {
return (
<div className="App">
<Header branding="Learn Tracker"/>
<div className="container">
<Learning />
</div>
</div>
);
}
}
export default App;
另一个Learning.js：
import React, { Component } from 'react'
import Resource from './Resource';
import axios from 'axios';
class Learning extends Component {
constructor(props){
super(props);
this.state = {
resource: [{}]
}
this.fetchData();
}
fetchData(){
axios.get('/api/all')
.then(result => {
this.setState({resource: result.data});
})
.catch(err => {
console.log(err);
});
}
render() {
const {resource} = this.state;
resource.map((resource) => {
return (
<Resource resource={resource} />
)
});
return(
<div>
{resource}
</div>
);
}
}
export default Learning;
Resource.js:
import React, { Component } from 'react';
import PropTypes from 'prop-types';
class Resource extends Component {
render() {
const {resource} = this.props;
return (
<div className="card mb-3">
<div className="card-header">
<h4>{ resource[0].maintopic.title }</h4>
</div>
<div className="card-body">
<h4 className="card-title">{ resource[0].maintopic.topic.title }</h4>
<ul className="list-group">
<li className="list-group-item">
{ resource[0].maintopic.topic.subtopic.title }
<div className="card-body">
<ul className="list-group list-group-flush">
<li className="list-group-item">Title: { resource[0].maintopic.topic.subtopic.resources[0].title }</li>
<li className="list-group-item">Link: { resource[0].maintopic.topic.subtopic.resources[0].link }</li>
<li className="list-group-item">Concluded: { resource[0].maintopic.topic.subtopic.resources[0].concluded }</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
)
}
}
Resource.propTypes = {
resource: PropTypes.object.isRequired
}
export default Resource;
最后是Header.js：
import React from 'react'
import PropTypes from 'prop-types';
import 'bootstrap/dist/css/bootstrap.min.css';
import '../App.css';
import '../index.css';
const Header = props => {
const { branding } = props;
return (
<nav className="navbar navbar-expand-sm navbar-dark bg-primary mb-3 py-3">
<div className="container">
<a href="/" className="navbar-brand">{branding}</a>
<div>
<ul className="navbar-nav mr-auto">
<li className="nav-item">
<a href="/" className="nav-link">Home</a>
</li>
<li className="nav-item text-white"><p className="nav-link"><span className="branco">|</span></p></li>
<li className="nav-item">
<a href="/" className="nav-link">About</a>
</li>
</ul>
</div>
</div>
</nav>
)
}
Header.defaultProps = {
branding: "Learning Tracker"
}
Header.PropTypes = {
branding: PropTypes.string.isRequired
}
export default Header;
请帮助我了解如何为应用程序的结构找到最佳解决方案。
提前谢谢你。
最好的问候。
【问题讨论】：
标签： javascript node.js mongodb reactjs software-design