RedirectObserver.php

<?php

namespace App\Observers;

use Illuminate\Database\Eloquent\Model;

class RedirectObserver
{
    const REDIRECTS = [
        \Modules\Shop\Entities\Product::class => [
            'route' => 'product',
            'properties' => ['domain','slug'],
            'check' => 'slug',
        ],
    ];

    public function updating(Model $model)
    {
        $redirectData = null;

        foreach(self::REDIRECTS as $className => $redirect) {
            if(is_a($model, $className)) {
                $redirectData = $redirect;
                break; 
            }
        }

        if(!$redirectData) return;

        $old = $model->getOriginal($redirectData['check']);
        $new = $model->{$redirectData['check']};
        if($old === $new) return;

        Redirect::create([
            'from' => $this->createUrl($redirectData['route'], $model, $redirectData['properties'], true),
            'to' => $this->createUrl($redirectData['route'], $model, $redirectData['properties']),
        ]);
    }

    private function createUrl($route, $model, $propertiesNames, $old=false)
    {
        $properties = [];
        foreach ($propertiesNames as $key => $propertyName) {
            $properties[$propertyName] = $old ? $model->getOriginal($propertyName) : $model->{$propertyName};
        }

        return route($route, $properties);
    }
}