Searchable cascade via dot notation

gist.php

<?php

use Illuminate\Support\Collection;
use Laravel\Scout\Searchable;

abstract class Cascade
{
  protected $models = [
    // Organization::class => ['users']
  ];
  
  public function getModels() {
    return $this->models;
  }

  public static function boot() {
    foreach ((new static)->getModels() as $class => $touches) {
      $class::saved(function ($instance) use ($touches) {
        foreach ($touches as $touched) {
          Collection::make(explode('.', $touched))->reduce(function ($relation, $touched) {
            return tap($relation->$touched, function ($touched) {
              Collection::wrap($touched)->pipe(function ($touched) {
                if (! in_array(Searchable::class, class_uses($touched->first()))) {
                  return new Collection;
                }

                return $touched;
              })->each->searchable();
            });
          }, $instance);
        }
      });
    }
  }
}