express&mongoose 연결 및 설정

const express = require('express'); 
const path = require('path');
const methodOverride = require('method-override')
const mongoose = require('mongoose');
const Campground = require('./models/campground')
mongoose.connect('mongodb://localhost:27017/camp', {
    useNewUrlParser: true
});

const db = mongoose.connection;
db.on('error', err => {
    console.log(err);
  });
db.once("open", ()=> {
    console.log("Database connected");
})
const app = express();
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'ejs')
app.use(express.urlencoded({extended: true}))
app.use(methodOverride('_method'));