Defining schemas and models in Express - Mini Project: Build & Apply

Defining Schemas and Models in Express with Mongoose

📖 Scenario: You are building a simple Express app to manage a list of books in a library. Each book has a title, author, and number of pages.

🎯 Goal: Create a Mongoose schema and model for the books collection to store book details in MongoDB.

📋 What You'll Learn

Create a Mongoose schema named bookSchema with fields title, author, and pages

Add a model named Book using the bookSchema

Use correct Mongoose types: String for title and author, Number for pages

Export the Book model

💡 Why This Matters

🌍 Real World

Defining schemas and models is essential for structuring data in MongoDB when building backend applications with Express and Mongoose.

💼 Career

Backend developers often create schemas and models to ensure data consistency and to interact with databases efficiently.

1

Set up Mongoose import and connection

Write the code to import mongoose and connect to a MongoDB database at mongodb://localhost:27017/library.

Express

// Import mongoose and connect to MongoDB
// Your code here

Need a hint?

Use require('mongoose') to import mongoose. Use mongoose.connect() with the given URL.

2

Create the bookSchema with fields

Create a Mongoose schema called bookSchema with fields: title and author as String, and pages as Number.

Express

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/library');

// Define bookSchema with title, author, and pages
// Your code here

Need a hint?

Use new mongoose.Schema({ ... }) and define each field with its type.

3

Create the Book model from bookSchema

Create a Mongoose model named Book using mongoose.model with the schema bookSchema.

Express

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/library');

const bookSchema = new mongoose.Schema({
  title: String,
  author: String,
  pages: Number
});

// Create Book model from bookSchema
// Your code here

Need a hint?

Use mongoose.model('Book', bookSchema) to create the model.

4

Export the Book model

Export the Book model using module.exports.

Express

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/library');

const bookSchema = new mongoose.Schema({
  title: String,
  author: String,
  pages: Number
});

const Book = mongoose.model('Book', bookSchema);

// Export the Book model
// Your code here

Need a hint?

Use module.exports = Book to export the model for use in other files.