README

Automatically dispatch Laravel events when your model's status field changes. Perfect for tracking workflow states, order processing, and any multi-step business processes.

Installation

composer require kdabrow/custom-events

Features

• 🚀 Automatic Event Dispatching - Events are fired when status changes
• 🎯 BackedEnum Support - Works only with PHP 8.1+ BackedEnums for type safety
• 🔧 Configurable Field Names - Customize which field triggers events
• 📝 Convention-Based Naming - Automatic event class name generation
• 🛡️ Safe by Default - Only dispatches events when classes exist
• ✅ Laravel 10/11/12 Compatible - Works with modern Laravel versions

Quick Start

1. Create Your Status Enum

<?php

namespace App\Enums;

enum OrderStatus: string
{
    case PENDING = 'pending';
    case PROCESSING = 'processing';
    case SHIPPED = 'shipped';
    case DELIVERED = 'delivered';
    case CANCELLED = 'cancelled';
}

2. Add Trait to Your Model

<?php

namespace App\Models;

use App\Enums\OrderStatus;
use Illuminate\Database\Eloquent\Model;
use Kdabrow\CustomEvents\CustomEventsTrait;

class Order extends Model
{
    use CustomEventsTrait;

    protected $fillable = ['status', 'total', 'customer_email'];

    protected function casts(): array
    {
        return [
            'status' => OrderStatus::class,
        ];
    }

    public function getEventFieldName(): string
    {
        return 'status';
    }
}

3. Create Event Classes

The trait automatically looks for events following this naming pattern: \App\Events\{ModelName}{StatusName}

<?php

namespace App\Events;

use App\Models\Order;
use App\Enums\OrderStatus;
use Illuminate\Foundation\Events\Dispatchable;

class OrderProcessing
{
    use Dispatchable;

    public function __construct(
        public Order $order,
        public OrderStatus $newStatus,
        public ?OrderStatus $oldStatus
    ) {}
}

<?php

namespace App\Events;

use App\Models\Order;
use App\Enums\OrderStatus;
use Illuminate\Foundation\Events\Dispatchable;

class OrderShipped
{
    use Dispatchable;

    public function __construct(
        public Order $order,
        public OrderStatus $newStatus,
        public ?OrderStatus $oldStatus
    ) {}
}

4. Use Your Model

// Create an order - dispatches OrderPending event
$order = Order::create([
    'status' => OrderStatus::PENDING,
    'total' => 99.99,
    'customer_email' => 'customer@example.com'
]);

// Update status - dispatches OrderProcessing event
$order->update(['status' => OrderStatus::PROCESSING]);

// Use the helper method - dispatches OrderShipped event
$order->updateEventField(OrderStatus::SHIPPED);

Advanced Usage

Custom Status Field Name

If your status field has a different name:

public function getEventFieldName(): string
{
    return 'workflow_state'; // Instead of 'status'
}

Event Registration

Register your event listeners in EventServiceProvider:

<?php

namespace App\Providers;

use App\Events\OrderProcessing;
use App\Events\OrderShipped;
use App\Listeners\HandleOrderProcessing;
use App\Listeners\HandleOrderShipped;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

class EventServiceProvider extends ServiceProvider
{
    protected $listen = [
        OrderProcessing::class => [
            HandleOrderProcessing::class,
        ],
        OrderShipped::class => [
            HandleOrderShipped::class,
        ],
    ];
}

Testing Events

<?php

namespace Tests\Feature;

use App\Models\Order;
use App\Enums\OrderStatus;
use App\Events\OrderProcessing;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\Event;
use Tests\TestCase;

class OrderEventTest extends TestCase
{
    use RefreshDatabase;

    public function test_order_processing_event_is_dispatched()
    {
        Event::fake();

        $order = Order::create([
            'status' => OrderStatus::PENDING,
            'total' => 99.99,
            'customer_email' => 'test@example.com'
        ]);

        $order->update(['status' => OrderStatus::PROCESSING]);

        Event::assertDispatched(OrderProcessing::class, function ($event) use ($order) {
            return $event->order->id === $order->id
                && $event->newStatus === OrderStatus::PROCESSING
                && $event->oldStatus === OrderStatus::PENDING;
        });
    }
}

How It Works

1. Trait Bootstrapping: When your model is first used, the trait registers listeners for created and updated model events.

2. Status Change Detection: On each model event, the trait checks if the status field has changed and contains a BackedEnum.

3. Event Name Generation: Converts enum values to PascalCase and combines with model name:

   • OrderStatus::PROCESSING → OrderProcessing
   • JobApplication + UNDER_REVIEW → JobApplicationUnderReview

4. Conditional Dispatching: Only dispatches events if the corresponding event class exists.

Event Naming Convention

Events follow this pattern: \App\Events\{ModelName}{StatusName}

Requirements

• PHP 8.2+
• Laravel 10.0+
• Status field must use BackedEnum

Testing

composer test

License

MIT License. See LICENSE file for details.