A trait for Laravel (v8) that uses model events to set a slug field based on another field

HasSlug.php

<?php

namespace App\Traits;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Str;

/**
 * Handles the logic for settings slugs
 */
trait HasSlug
{
    protected static function bootHasSlug(): void
    {
        static::creating(function (Model $model) {
            $sluggableSeparator = property_exists($model, 'sluggableSeparator') ? $model->sluggableSeparator : '-';
            $sluggableAttribute = method_exists($model, 'getSluggableAttribute') ? $model->getSluggableAttribute() : 'name';
            $sluggableField = method_exists($model, 'getSluggableField') ? $model->getSluggableField() : 'slug';
            
            // use app container to allow mocking/spying/replacing of the slug call
            $model->{$sluggableField} = optional($model)->{$sluggableField} ? (string) app(Str::class)->slug($model->{$sluggableField}, $sluggableSeparator) : (string) app(Str::class)->slug($model->{$sluggableAttribute});
        });

        static::updating(function (Model $model) {
            $sluggableSeparator = property_exists($model, 'sluggableSeparator') ? $model->sluggableSeparator : '-';
            $sluggableAttribute = method_exists($model, 'getSluggableAttribute') ? $model->getSluggableAttribute() : 'name';
            $sluggableField = method_exists($model, 'getSluggableField') ? $model->getSluggableField() : 'slug';

            // use app container to allow mocking/spying/replacing of the slug call
            $model->{$sluggableField} = optional($model)->{$sluggableField} ? (string) app(Str::class)->slug($model->{$sluggableField}, $sluggableSeparator) : (string) app(Str::class)->slug($model->{$sluggableAttribute});
        });
    }
}