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app.js
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app.js
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const express = require('express')
const { connectToDb, getDb } = require('./db')
const { ObjectId } = require('mongodb')
// Init & Middleware
const app = express()
app.use(express.json())
// Connect to Db
let db
connectToDb((err) => {
if (!err) {
// Use local port 3000
app.listen(3000, () => {
console.log('*** Listening to Port: 3000 ***')
})
db = getDb()
}
})
// Routes ( GET )
app.get('/books', (req, res) => {
// Empty array to store all the returned books
let books = []
const page = req.query.page || 0
const booksPerPage = 3
// find() returns a cursor
// Next step is to fetch the cursor (data) using toArray or forEach
// forEach is used to push the books to an array
// forEach is async, needs time to finish, when finished then() is executed next
// .json will display the books array in a json format
db.collection('books')
.find()
.sort({ title: 1 })
.skip(page * booksPerPage)
.limit(booksPerPage)
.forEach(book => books.push(book))
.then(() => {
res.status(200).json(books)
})
.catch(() => {
res.status(500).json({ error: 'Could not fetch the documents' })
})
})
app.get('/books/:id', (req, res) => {
if (ObjectId.isValid(req.params.id)) {
db.collection('books')
.findOne({ _id: ObjectId(req.params.id) })
.then(doc => {
res.status(200).json(doc)
})
.catch(err => {
res.status(500).json({ error: 'Could not fetch the document' })
})
}
else {
res.status(500).json({ error: 'Not a valid document _id' })
}
})
app.post('/books', (req, res) => {
const book = req.body
db.collection('books')
.insertOne(book)
.then(result => {
res.status(201).json(result)
})
.catch(err => {
res.status(500).json({ err: 'Could not create a new document' })
})
})
app.delete('/books/:id', (req, res) => {
if (ObjectId.isValid(req.params.id)) {
db.collection('books')
.deleteOne({ _id: ObjectId(req.params.id) })
.then(result => {
res.status(200).json(result)
})
.catch(err => {
res.status(500).json({ error: 'Could not delete the document' })
})
}
else {
res.status(500).json({ error: 'Not a valid document _id' })
}
})
app.patch('/books/:id', (req, res) => {
const updates = req.body
if (ObjectId.isValid(req.params.id)) {
db.collection('books')
.updateOne({ _id: ObjectId(req.params.id) }, { $set: updates })
.then(result => {
res.status(200).json(result)
})
.catch(err => {
res.status(500).json({ error: 'Could not update the document' })
})
}
else {
res.status(500).json({ error: 'Not a valid document _id' })
}
})