isNotEmpty() && $students->isNotEmpty() && $academicYears->isNotEmpty()) { foreach ($classRooms as $classRoom) { foreach ($students as $student) { foreach ($academicYears as $academicYear) { // Buat ClassStudent baru untuk setiap kombinasi ClassStudent::create([ 'class_room_id' => $classRoom->id, 'student_id' => $student->id, 'academic_year_id' => $academicYear->id, ]); } } } } } }