如何使用 JS 生成的数据库将对象推送到 json-server 中的数组？

Question

我有一个 json-server 应用程序运行，它在启动时使用 JS 动态生成数据库。我创建的数据被包装到一个 'users' 对象中，如下所示：

{
    "users": [
        {
            "id": "user_id_0",
            "email": "Andy_Cummerata@hotmail.com",
            "first_name": "Consuelo",
            "last_name": "Labadie",
            "last_login_time": 1638643810,
            "role": "Manager"
        },
        {
            "id": "user_id_1",
            "email": "Ricardo_Jacobs45@yahoo.com",
            "first_name": "Albina",
            "last_name": "Nienow",
            "last_login_time": 1637479536,
            "role": "User"
        }
    ],
    "Page": 1,
    "PageSize": 10,
    "Total": 10
}

我希望能够将新用户推送到该数组。因为我渲染我的响应来包装它，所以如果我只使用本机 POST，请求就会失败。所以我想为编写自己的函数，但我不知道如何访问和修改我创建的数据库？

如何创建将数据发送到动态生成的数据库的函数？

以下是我的其余文件，以备不时之需。

文件：db.js

var faker = require('faker');
var utils = require('../utils.js');
const users_created = 10

module.exports = function () {
    const data = { users: [] }

    for (var i = 0; i < users_created; i++) {
        data.users.push({
            id: "user_id_" + i,
            email: faker.internet.email(),
            first_name: faker.name.firstName(),
            last_name: faker.name.lastName(),
            last_login_time: utils.string_to_oom_epoch(faker.date.recent(days = 40).toISOString().replace('Z', '')),
            role: faker.helpers.randomize(['Admin', 'Manager', 'User'])
        })
    }

    return data;
}

文件：server.js

const jsonServer = require('json-server');
const server = jsonServer.create()
const router = jsonServer.router(require('./db.js')())
const middlewares = jsonServer.defaults()

server.use(middlewares)
server.use(jsonServer.bodyParser)

router.render = (req, res) => {
    if (req.url.startsWith('/generic_users_list')) {
            page = parseInt(req.query.page)
    pageSize = parseInt(req.query.pagesize)
    filter_email = req.query.email

    users = res.locals.data.users
    if (filter_email !== undefined) {
        filtered_users = []
        for (var i = 0; i < users.length; i++)
            if (users[i].email.toLowerCase() == filter_email.toLowerCase())
                filtered_users.push(users[i])
        users = filtered_users
    }

    if (!isNaN(pageSize)) {
        res.jsonp({
            users: users.slice(page * pageSize, (page + 1) * pageSize),
            Page: page,
            PageSize: pageSize,
            Total: users.length
        })
    } else {
        res.jsonp({
            users: users,
            Page: 1,
            PageSize: users.length,
            Total: users.length
        })
    }
    } else {
        res.jsonp(res.locals.data)
    }
}

server.post('/generic_users_list', (req, res) => {
    new_user = {
        id: req.body.id,
        email: req.body.email,
        first_name: req.body.first_name,
        last_name: req.body.last_name,
        last_login_time: req.body.last_login_time,
        role: req.body.role
    }
    // WHAT DO I HAVE TO DO HERE TO ADD 'new_user' TO MY DATABASE?
})

server.use(router)

server.listen(port = 3000, () => {
    console.log("port")
    console.log('JSON Server is running')
    console.log('http://localhost:' + port)
})

Answer 1

您可以将 users 数组提取出导出范围并将其定义为常量。这样它就存在于内存中，您可以向其中添加项目。您只需要导出另一个函数，这可能会将用户添加到您的内存数据库中。

var faker = require('faker');
var utils = require('../utils.js');
const users_created = 10

const data = { users: [] }
let next_id = users_created;

function initDb() {
    for (var i = 0; i < users_created; i++) {
        data.users.push({
            id: "user_id_" + i,
            email: faker.internet.email(),
            first_name: faker.name.firstName(),
            last_name: faker.name.lastName(),
            last_login_time: utils.string_to_oom_epoch(faker.date.recent(days = 40).toISOString().replace('Z', '')),
            role: faker.helpers.randomize(['Admin', 'Manager', 'User'])
        })
    }

    return data;
}

function addUser(user) {
    user.id = "user_id_" + next_id++;
    data.users.push(user);
}

module.exports = {
    initDb,
    addUser,
    data
}

const jsonServer = require('json-server');
const server = jsonServer.create()
const user_db = require('./db.js')
const middlewares = jsonServer.defaults()

server.use(middlewares)
server.use(jsonServer.bodyParser)

user_db.initDb()
const router = jsonServer.router(user_db.data)

router.render = (req, res) => {
    if (req.url.startsWith('/generic_users_list')) {
            page = parseInt(req.query.page)
    pageSize = parseInt(req.query.pagesize)
    filter_email = req.query.email

    users = res.locals.data.users
    if (filter_email !== undefined) {
        filtered_users = []
        for (var i = 0; i < users.length; i++)
            if (users[i].email.toLowerCase() == filter_email.toLowerCase())
                filtered_users.push(users[i])
        users = filtered_users
    }

    if (!isNaN(pageSize)) {
        res.jsonp({
            users: users.slice(page * pageSize, (page + 1) * pageSize),
            Page: page,
            PageSize: pageSize,
            Total: users.length
        })
    } else {
        res.jsonp({
            users: users,
            Page: 1,
            PageSize: users.length,
            Total: users.length
        })
    }
    } else {
        res.jsonp(res.locals.data)
    }
}

server.post('/generic_users_list', (req, res) => {
    new_user = {
        id: req.body.id,
        email: req.body.email,
        first_name: req.body.first_name,
        last_name: req.body.last_name,
        last_login_time: req.body.last_login_time,
        role: req.body.role
    }
    user_db.addUser(new_user)
})

server.use(router)

server.listen(port = 3000, () => {
    console.log("port")
    console.log('JSON Server is running')
    console.log('http://localhost:' + port)
})

如何使用 JS 生成的数据库将对象推送到 json-server 中的数组？

How to push objects to an array in json-server with a database generated in JS?

javascript

node.js

json-server