<?php
  
  namespace App\Providers;
  
  use App\Models\Job_title;
  use Illuminate\Support\Facades\View;
  use Illuminate\Support\ServiceProvider;
  
  class MyServiceProvider extends ServiceProvider
  {
      /**
       * Register services.
       *
       * @return void
       */
      public function register()
      {
          //
      }
  
      /**
       * Bootstrap services.
       *
       * @return void
       */
      public function boot()
      {
          $views = ['admin.job_titles.parent_id'];
          View::composer($views,
              function($view)
              {
                  static $items = null;
  
                  if (is_null($items)) {
                      $items = Job_title::query()->
                                          orderByDesc('sort')->
                                          orderBy('name')->
                                          active()->
                                          get();
                      $parent = 0;
                      $view->with(['items' => $items, 'parent' => $parent]);
                  } else {
                      $view->with(['items' => $items]);
                  }
  
              }
          );
      }
  }