public function getQuestionAndApplicantIds(ClientSurvey $client_survey): array 	{ 		$categories = Category::with(['questions'])->where('survey_id', $client_survey->survey_id)->get(); 		$applicants = $client_survey->getApplicants();  		return [ 			'question_ids' => $categories->pluck('questions')->flatten()->pluck('id')->toArray(), 			'applicants_ids' => $applicants->pluck('id')->toArray(), 		]; 	}