public async Task <ActionResult <IEnumerable <AttendanceOfLectureResource> > > GetAttendanceOfLectureByName(string lectureName) { var lecture = await _lectureService.GetAllLecturesWithStudents() .SingleOrDefaultAsync(l => l.Name == lectureName); if (lecture == null) { return(NotFound()); } var attendance = lecture.StudentLectures; var attendanceResource = _mapper.Map <IEnumerable <StudentLecture>, IEnumerable <AttendanceOfLectureResource> >(attendance); return(Ok(attendanceResource)); }