index.js

const express = require('express')
const path = require('path')
const db = require('mongoose')
const Posts = require('./posts')
const Categorys = require('./categorys')

const app = express()
//substituir o *** pelo token de autenticação do seu banco de dados em mongodb
db.connect('***',
{useNewUrlParser:true,useUnifiedTopology:true}).then(()=>{
    console.log('db connected...')
}).catch((err)=>{
    console.log(err.message)
})

app.engine('html',require('ejs').renderFile)
app.set('view engine','html')
app.set('views', path.join(__dirname,'/views'))
app.use('/public', express.static(path.join(__dirname , '/public')))
app.use(express.json())
app.use(express.urlencoded({ extended: false}))

app.get('/', (req,res) => {
    if (req.query.search == null) {
        Posts.find({}).sort({'_id':-1}).exec((err,posts)=>{
            Posts.find({}).sort({'views': -1}).limit(4).exec((err,postsTop)=>{
                res.render('index',{posts:posts,postsTop:postsTop})
            })
        })
    }else{
        Posts.find({title: {$regex: req.query.search,$options:"i"}},(err,posts)=>{
            posts = posts.map((val)=>{
                return {
                    title: val.title,
                    image: val.image,
                    category: val.category,
                    content: val.content,
                    slug: val.slug,
                    author: val.author,
                    views: val.views
                }
            })
            Posts.find({}).sort({'views': -1}).limit(4).exec((err,postsTop)=>{
                res.render('search',{posts:posts,postsTop:postsTop,count:posts.length})
            })
        })
    }
})
app.get('/about', (req,res) => {res.redirect('https://joao-bonifacio.github.io/Portifolio/')})
app.get('/contact', (req,res) => {res.render('contact')})
app.get('/:slug', (req,res) => {
        Posts.findOneAndUpdate({slug:req.params.slug},{$inc:{views:1}},{new:true},(err,response)=>{
            if (response != null) {
                Posts.find({}).sort({'_id':-1}).exec((err,posts)=>{
                    Posts.find({}).sort({'views': -1}).limit(4).exec((err,postsTop)=>{
                        res.render('single',{letter:response,posts:posts,postsTop:postsTop})
                    })   
                }) 
            }else{
                res.redirect('/')
            }
        })
})

app.listen(3000,() => {
    console.log('running...')
})