public function deleting(Survey $survey): void 	{ 		$survey->categories->each(function (Category $item): void { 			$item->delete(); 		});  		$survey->cycles->each(function (Cycle $item): void { 			$item->delete(); 		});  		$survey->rewards->each(function (Reward $item): void { 			$item->delete(); 		}); 	}