Data modeling best practices in Firebase - Mini Project: Build & Apply

Data Modeling Best Practices with Firebase

📖 Scenario: You are building a simple app to store user profiles and their favorite books using Firebase Firestore. You want to organize your data well so it is easy to read and update.

🎯 Goal: Create a Firebase Firestore data model with collections and documents that follow best practices for structuring user profiles and their favorite books.

📋 What You'll Learn

Create a users collection with user documents

Each user document must have name and email fields

Add a favoriteBooks subcollection inside each user document

Each book document in favoriteBooks must have title and author fields

💡 Why This Matters

🌍 Real World

This data model is useful for apps that store user profiles and their related data, like favorite items or preferences, in a clear and scalable way.

💼 Career

Understanding Firebase data modeling is essential for cloud developers and backend engineers working with NoSQL databases and real-time apps.

1

Create the users collection with user documents

Create a Firebase Firestore data structure with a users collection containing two user documents. Each user document should have the exact fields: name and email. Use the user IDs user1 and user2 with these values: name: "Alice", email: "[e-mail]" for user1 and name: "Bob", email: "[e-mail]" for user2.

Firebase

// Your code here to create users collection with user1 and user2 documents

Need a hint?

Think of users as a collection holding documents named user1 and user2. Each document is an object with name and email.

2

Add a favoriteBooks subcollection for each user

Add a favoriteBooks subcollection inside each user document in the users collection. For now, create empty favoriteBooks objects for both user1 and user2.

Firebase

const users = {
  user1: { name: "Alice", email: "[e-mail]" },
  user2: { name: "Bob", email: "[e-mail]" }
};
// Add empty favoriteBooks subcollections for user1 and user2 below

Need a hint?

Think of favoriteBooks as a small collection inside each user document. Start with empty objects to hold books later.

3

Add book documents inside favoriteBooks subcollections

Inside the favoriteBooks subcollection for user1, add two book documents with IDs book1 and book2. Each book document must have title and author fields. Use these exact values: book1 with title: "1984" and author: "George Orwell", and book2 with title: "Brave New World" and author: "Aldous Huxley". Leave user2's favoriteBooks empty for now.

Firebase

const users = {
  user1: {
    name: "Alice",
    email: "[e-mail]",
    favoriteBooks: {}
  },
  user2: {
    name: "Bob",
    email: "[e-mail]",
    favoriteBooks: {}
  }
};
// Add book1 and book2 documents inside user1's favoriteBooks

Need a hint?

Inside user1.favoriteBooks, add two objects named book1 and book2 with the given fields.

4

Complete the data model with proper nesting

Ensure the entire Firebase Firestore data model is a single JavaScript object named users with user documents containing name, email, and a favoriteBooks subcollection. Confirm that user1 has two book documents and user2 has an empty favoriteBooks subcollection.

Firebase

const users = {
  user1: {
    name: "Alice",
    email: "[e-mail]",
    favoriteBooks: {
      book1: { title: "1984", author: "George Orwell" },
      book2: { title: "Brave New World", author: "Aldous Huxley" }
    }
  },
  user2: {
    name: "Bob",
    email: "[e-mail]",
    favoriteBooks: {}
  }
};
// Verify the complete data model structure

Need a hint?

Review the entire object to confirm all parts are present and correctly nested.