public function getEngagementApplicantsBaseCollection(array $engagementCategoryIds, array $applicantIds): void 	{ 		$engagementCategoryIds = implode("','", $engagementCategoryIds); 		$applicantIds = implode("','", $applicantIds);  		$query = DB::select(" 			select applicant_id, avg(answer_value) as answer_value_average 			from answers 			where answers.question_id in (select id from questions where questions.category_id in ('$engagementCategoryIds')) 			and answers.applicant_id in ('$applicantIds') 			group by applicant_id 			");  		$this->engagementApplicants = collect($query); 	}