Model events and observers in Laravel - Mini Project: Build & Apply

Model Events and Observers in Laravel

📖 Scenario: You are building a Laravel application to manage a list of books. You want to automatically log a message whenever a book is created in the database.

🎯 Goal: Create a Laravel model called Book and an observer called BookObserver. Set up the observer to listen for the created event on the Book model and log a message when a new book is added.

📋 What You'll Learn

Create a Book model

Create a BookObserver class

Register the observer in the AppServiceProvider

Implement the created method in the observer to log a message

💡 Why This Matters

🌍 Real World

Model events and observers help automate tasks like logging, notifications, or data cleanup when database records change.

💼 Career

Understanding Laravel model events and observers is essential for backend developers to write clean, maintainable, and reactive applications.

1

Create the Book model

Create a Laravel model called Book using the php artisan make:model Book command or by creating a class Book that extends Illuminate\Database\Eloquent\Model.

Laravel

# Create the Book model class here

// Your code here

Need a hint?

The model class should be in the App\Models namespace and extend Model.

2

Create the BookObserver class

Create an observer class called BookObserver in the App\Observers namespace. Add a public method created that accepts a Book instance as a parameter.

Laravel

<?php

// Create the BookObserver class here

// Your code here

Need a hint?

The observer class should have a created method that receives a Book object and logs a message.

3

Register the observer in AppServiceProvider

In the App\Providers\AppServiceProvider class, import Book and BookObserver. In the boot method, register the observer by calling Book::observe(BookObserver::class);.

Laravel

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

// Your code here to import Book and BookObserver

class AppServiceProvider extends ServiceProvider
{
    public function boot()
    {
        // Register the observer here
        // Your code here
    }
}

Need a hint?

Make sure to import both Book and BookObserver classes and call observe inside the boot method.

4

Test the observer by creating a Book instance

Add code to create a new Book instance with title set to 'Laravel Basics' and save it to the database. This will trigger the created event and log the message.

Laravel

<?php

// Create and save a new Book instance here

// Your code here

Need a hint?

Create a new Book object, set the title property, and call save() to trigger the observer.