基于nodejs、mongodb之外卖平台后端接口开发文档(四)

前言： 这一章我们来实现这个模块的增删改查接口

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1. 首先来设计接口模型，在modes文件夹下新建Category.js，模型结构如下：

const mongoose = require("mongoose");
const Schema = mongoose.Schema;
const categorySchema = new Schema({
    // 上级id，默认0是顶级分类
    pid: { type: String, required: true, default: 0 },
    // 分类名称
    categoryName: { type: String, required: true },
    // 分类图片
    coverUrl: { type: String, required: true },
    // 是否是外链，默认不是外链
    isLinks: { type: String, required: true, default: "no" },
    // 外链地址
    links: { type: String },
    // 是否在首页显示，默认不显示
    isShowHome: { type: String, required: true, default: "no" },
    date: { type: Date, default: Date.now }
})
module.exports = Category = mongoose.model("Category", categorySchema)

2. 然后在routers文件夹下新建category.js，引入基础代码，在app.js也要引入
   ps:后面就不在一一说明引入的事情了，总之要记得 ，新建的路由js和模型js一定要在app.js内引入才生效

var express = require('express');
var router = express.Router();
//引入模型
var Category = require("../models/Category");
//引入过滤filter.js
const filter = require("../utils/filter")
//引入token.js  
var vertoken = require('../utils/token')
/** 接口区域 */


/** 接口区域 */
module.exports = router;

3. 下面开发新增分类接口

//新增分类接口
router.post('/category/add', filter.categoryAddFilter, (req, res) => {
    const categorys = {}
    if (req.body.pid) categorys.pid = req.body.pid;
    if (req.body.categoryName) categorys.categoryName = req.body.categoryName;
    if (req.body.coverUrl) categorys.coverUrl = req.body.coverUrl;
    if (req.body.isLinks) categorys.isLinks = req.body.isLinks;
    if (req.body.links) categorys.links = req.body.links;
    if (req.body.isShowHome) categorys.isShowHome = req.body.isShowHome;
    new Category(categorys).save().then((val) => {
        res.json({
            code: 200,
            message: '新增成功'
        });
    })
})

4. 下面开发查询分类接口

//查询分类列表，默认查询顶级的显示在首页的分类
router.post('/category/list', (req, res) => {
    Category.find({ pid: '0', isShowHome: 'yes' }, (err, docs) => {
        if (docs.length == 0) {
            res.json({
                code: -1,
                message: "暂无数据"
            })
        } else {
            res.json({
                code: 200,
                data: docs,
                message: '查询成功'
            })
        }
    })
})

5. 下面开发修改分类的接口,这里加了校验token是否过期的逻辑

//修改分类接口
router.put('/category/update/:id', (req, res) => {
    vertoken.getToken(req.headers.token).then((data) => {
        const categorys = {}
        if (req.body.pid) categorys.pid = req.body.pid;
        if (req.body.categoryName) categorys.categoryName = req.body.categoryName;
        if (req.body.coverUrl) categorys.coverUrl = req.body.coverUrl;
        if (req.body.isLinks) categorys.isLinks = req.body.isLinks;
        if (req.body.links) categorys.links = req.body.links;
        if (req.body.isShowHome) categorys.isShowHome = req.body.isShowHome;
        Category.findOneAndUpdate({ _id: req.params.id }, { $set: categorys }, {
            new: true
        }).then(docs => res.json({
            code: 200,
            message: "修改成功"
        }))
    }).catch(err => {
        res.json({
            code: 401,
            message: "token失效了"
        })
    })
})

6. 下面开发删除分类的接口

//删除分类接口
router.delete('/category/delete/:id', (req, res) => {
    Category.findOneAndRemove({ _id: req.params.id }).then(docs => {
        res.json({
            code: 200,
            message: "删除成功"
        })
    }).catch(err => {
        res.json({
            code: -1,
            data: err,
            message: "删除失败"
        })
    });
})

end
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