php - Laravel Model Events - I'm a bit confused about where they're meant to go

Question

So the way I see it is that a good Laravel application should be very model- and event-driven.

I have a Model called Article. I wish to send email alerts when the following events happen:

• When an Article is created
• When an Article is updated
• When an Article is deleted

The docs say I can use Model Events and register them within the boot() function of AppProvidersEventServiceProvider.

But this is confusing me because...

• What happens when I add further models like Comment or Author that need full sets of all their own Model Events? Will the single boot() function of EventServiceProvider just be absolutely huge?
• What is the purpose of Laravel's 'other' Events? Why would I ever need to use them if realistically my events will only respond to Model CRUD actions?

I am a beginner at Laravel, having come from CodeIgniter, so trying to wrap my head around the proper Laravel way of doing things. Thanks for your advice!

Answer 1

In your case, you may also use following approach:

// Put this code in your Article Model

public static function boot() {

    parent::boot();

    static::created(function($article) {
        Event::fire('article.created', $article);
    });

    static::updated(function($article) {
        Event::fire('article.updated', $article);
    });

    static::deleted(function($article) {
        Event::fire('article.deleted', $article);
    });
}

Also, you need to register listeners in AppProvidersEventServiceProvider:

protected $listen = [
    'article.created' => [
        'AppHandlersEventsArticleEvents@articleCreated',
    ],
    'article.updated' => [
        'AppHandlersEventsArticleEvents@articleUpdated',
    ],
    'article.deleted' => [
        'AppHandlersEventsArticleEvents@articleDeleted',
    ],
];

Also make sure you have created the handlers in AppHandlersEvents folder/directory to handle that event. For example, article.created handler could be like this:

<?php namespace AppHandlersEvents;

use AppArticle;
use AppServicesEmailMailer; // This one I use to email as a service class

class ArticleEvents {

    protected $mailer = null;

    public function __construct(Mailer $mailer)
    {
        $this->mailer = $mailer;
    }

    public function articleCreated(Article $article)
    {
        // Implement mailer or use laravel mailer directly
        $this->mailer->notifyArticleCreated($article);
    }

    // Other Handlers/Methods...
}