如何在node.js中为单独的路由文件和api文件更正我的代码

问题描述

当前，该用户模块有3个文件

routers / user.js （到目前为止，所有路由器功能都位于此文件中，我想在userServiceAPI.js中将它们分开）

models / user.js

userserviceAPI.js （我在这里需要帮助）

这是我的 routers / user.js

const express = require('express')
const User = require('../models/user')
const userModel=require('../models/user')
const router = new express.Router()
const multer = require('multer')
const userApi = require('../services/userservice.api')
//const sharp = require('sharp')
const auth = require('../db/auth')

//My trial code for separate API file
router.post('/addUser',userApi.addUser)


router.post('/users',async (req,res) => {
    const user = new User(req.body)

    try {
        await user.save()
        const token = await user.generateAuthToken()
        res.status(201).send({ user,token })
    } catch (e) {
        res.status(400).send(e)
    }
})

router.post('/users/login',res) => {
    try {
        const user = await User.findByCredentials(req.body.email,req.body.password)
        const token = await user.generateAuthToken()
        res.send({ user,token })
    } catch (e) {
        res.status(400).send()
    }
})

router.post('/users/logout',auth,res) => {
    try {
        req.user.tokens = req.user.tokens.filter((token) => {
            return token.token !== req.token
        })
        await req.user.save()

        res.send()
    } catch (e) {
        res.status(500).send()
    }
})

router.post('/users/logoutAll',res) => {
    try {
        req.user.tokens = []
        await req.user.save()
        res.send()
    } catch (e) {
        res.status(500).send()
    }
})

router.get('/users/me',res) => {
    res.send(req.user)
})

router.patch('/users/me',res) => {
    const updates = Object.keys(req.body)
    const allowedUpdates = ['name','email','password','age']
    const isValidOperation = updates.every((update) => allowedUpdates.includes(update))

    if (!isValidOperation) {
        return res.status(400).send({ error: 'Invalid updates!' })
    }

    try {
        updates.forEach((update) => req.user[update] = req.body[update])
        await req.user.save()
        res.send(req.user)
    } catch (e) {
        res.status(400).send(e)
    }
})

router.delete('/users/me',res) => {
    try {
        await req.user.remove()
        res.send(req.user)
    } catch (e) {
        res.status(500).send()
    }
})

const upload = multer({
    limits: {
        fileSize: 1000000
    },fileFilter(req,file,cb) {
        if (!file.originalname.match(/\.(jpg|jpeg|png)$/)) {
            return cb(new Error('Please upload an image'))
        }

        cb(undefined,true)
    }
})

router.post('/users/me/avatar',upload.single('avatar'),res) => {
    const buffer = await sharp(req.file.buffer).resize({ width: 250,height: 250 }).png().toBuffer()
    req.user.avatar = buffer
    await req.user.save()
    res.send()
},(error,req,res,next) => {
    res.status(400).send({ error: error.message })
})

router.delete('/users/me/avatar',res) => {
    req.user.avatar = undefined
    await req.user.save()
    res.send()
})

router.get('/users/:id/avatar',res) => {
    try {
        const user = await User.findById(req.params.id)

        if (!user || !user.avatar) {
            throw new Error()
        }

        res.set('Content-Type','image/png')
        res.send(user.avatar)
    } catch (e) {
        res.status(404).send()
    }
})

module.exports = router

这是我的 userserviceAPI.js

const express = require('express')
const userModel = require('../models/user')
const router = new express.Router()
const multer = require('multer')
const auth = require('../db/auth')

const addUser = (req,next) => {
    const user = new userModel(req.body)
    const token = user.generateAuthToken()
    userModel.create(req.body,(err,result) => {
        if (err) return res.status(400).json({ message: 'Please enter correct information.' }) 
        if (result) {
            return res.status(200).send({ user,token }).json({result : result})
        }
    })
}

module.exports = {
    addUser
}

执行得很好，我可以从邮递员中添加数据我的数据已成功显示在Robo 3T中，但在可视终端中出现了以下错误消息：

(node:819) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated,and will be removed in a future version. To use the new Server Discover and Monitoring engine,pass option { useUnifiedTopology: true } to the MongoClient constructor.
Server is up on port 3000
events.js:187
      throw er; // Unhandled 'error' event
      ^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at ServerResponse.setHeader (_http_outgoing.js:485:11)
    at ServerResponse.header (/Users/ruksz/Desktop/E-comm/node_modules/express/lib/response.js:771:10)
    at ServerResponse.send (/Users/ruksz/Desktop/E-comm/node_modules/express/lib/response.js:170:12)
    at ServerResponse.json (/Users/ruksz/Desktop/E-comm/node_modules/express/lib/response.js:267:15)
    at /Users/ruksz/Desktop/E-comm/services/userservice.api.js:13:58
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/helpers/promiseOrCallback.js:24:16
    at Function.<anonymous> (/Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:4855:21)
    at _done (/Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:3071:12)
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:3080:18
    at callbackWrapper (/Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:3036:11)
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:4832:16
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/helpers/promiseOrCallback.js:24:16
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:4855:21
    at model.<anonymous> (/Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:496:7)
    at /Users/ruksz/Desktop/E-comm/node_modules/kareem/index.js:315:21
    at next (/Users/ruksz/Desktop/E-comm/node_modules/kareem/index.js:209:27)
Emitted 'error' event on Function instance at:
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:4834:13
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/helpers/promiseOrCallback.js:24:16
    at /Users/ruksz/Desktop/E-comm/node_modules/mongoose/lib/model.js:4855:21
    [... lines matching original stack trace ...]
    at next (/Users/ruksz/Desktop/E-comm/node_modules/kareem/index.js:209:27)
    at /Users/ruksz/Desktop/E-comm/node_modules/kareem/index.js:182:9
    at /Users/ruksz/Desktop/E-comm/node_modules/kareem/index.js:507:38
    at processTicksAndRejections (internal/process/task_queues.js:75:11)
[nodemon] app crashed - waiting for file changes before starting...

我要做的就是将这个路由器API放在另一个文件中。预先感谢。

解决方法

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