全栈课程笔记：通用CRUD接口以及mongodb模型创建

建立mongodb模型

一、安装必要模块

npm i inflection -s

inflection 是用来将字符串转换为类名的模块，在本项目中会很便捷的对接CRUD通用接口的路由操作。

二、创建模型

首先我们依次建立 models/Category.js  models/Item.js

const mongoose = require('mongoose')

const schema = new mongoose.Schema({
    name: { type: String },
    parent: { type: mongoose.SchemaTypes.ObjectId, ref: 'Category' }

})

module.exports = mongoose.model('Category', schema)

 type: mongoose.SchemaTypes.ObjectId 是表示类型为mongodb中的ID号特殊类型

 ref: 'Category' 表示关联对应关系

三、CRUD通用接口

module.exports = app => {
    const express = require('express')
    const router = express.Router()
    const Category = require('../../models/Category')
    const Item = require('../../models/Item')
    router.post('/', async (req, res) => {
        const model = await req.Model.create(req.body)
        res.send(model)
    })
    router.put('/:id', async (req, res) => {
        const model = await req.Model.findByIdAndUpdate(req.params.id, req.body)
        res.send(model)
    })
    router.delete('/:id', async (req, res) => {
        const model = await req.Model.findByIdAndDelete(req.params.id)
        res.send({
            'success': true
        })
    })
    router.get('/', async (req, res) => {
        const queryOptions = {}
        if (req.Model.modelName == 'Category') {
            queryOptions.populate = 'parent'
        }
        const model = await req.Model.find().setOptions(queryOptions).limit(10)
        res.send(model)
    })
    router.get('/:id', async (req, res) => {
        const model = await req.Model.findById(req.params.id)
        res.send(model)
    })
    app.use('/admin/api/rest/:resource', async (req, res, next) => {
        const modelName = require('inflection').classify(req.params.resource)
        req.Model = require(`../../models/${modelName}`)
        next()
    }, router)
}

首先使用中间件将传输过来的modelName转换为类名与模型相对应。