/**
  * Display a listing of the resource.
  *
  * @return \Illuminate\Http\Response
  */
 public function index(Request $request)
 {
     $project_types = Project_type::all();
     if ($request->ajax()) {
         return $project_types->toArray();
     }
     return view('admin.project_types.index', ['project_types' => $project_types]);
 }