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app.js

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var createError = require('http-errors');

var express = require('express');

var path = require('path');

var cookieParser = require('cookie-parser');

var logger = require('morgan');

var indexRouter = require('./routes/index');

//var usersRouter = require('./routes/users');

const booksRouter = require('./routes/books'); // Modularizing the books-related routes

const db = require('./models/index'); // Importing the instance of 'sequelize' that was instantiated in the models/index.js file

// Testing the connection to the database and synchronizing the model

(async () => {

await db.sequelize.sync();

try {

await db.sequelize.authenticate();

console.log('The connection to the database was successful!'); // Connection successful

} catch (error) {

console.error('An error occurred when connecting to the database: ', error); // Connection not successful

}

})();

var app = express();

// view engine setup

app.set('views', path.join(__dirname, 'views'));

app.set('view engine', 'pug');

app.use(logger('dev'));

app.use(express.json());

app.use(express.urlencoded({ extended: false }));

app.use(cookieParser());

app.use( '/static', express.static(path.join(__dirname, 'public')) ); // Defining a '/static' path for express.static (not specified in the instructions)

// Home route

app.use('/', indexRouter);

// Books Router (books-related routes)

app.use('/', booksRouter);

/******* ERROR HANDLERS *******/

// Handling 404 errors

app.use((req, res, next) => {

const err = new Error();

err.status = 404;

err.message = "Page not found. Check details of the error on the screen.";

console.log(err.message, "Error status:", err.status); // Displaying error message and status on the console (not specified in the instructions)

res.status(err.status); // Setting the response status to the error status (not specified in the instructions)

res.render('page-not-found', {err, title: "Page Not Found"});

next(err);

});

// Global error handler

app.use((err, req, res, next) => {

if (err.status === 404) {

return;

} else {

err.status = err.status || 500;

err.message = err.message || "Server error. Check the Error Stack below for more details.";

console.log("Error status:", err.status, err.message);

res.status(err.status); // Setting the response status to the error status, although it wasn't directly mentioned in the instructions

res.render('error', {err});

}

});

module.exports = app;