public async Task <AddAttendeesViewModel> GetAddAttendeesViewModelAsync(int workDayId)
{
string mentorId = HttpContext.Current.User.Identity.GetUserId();
IEnumerable <StudentDTO> mentorsAllStudents = await studentService.GetByMentorId(mentorId);
IEnumerable <AttendanceDTO> attendances = await attendanceService.GetByWorkDayId(workDayId);
List <StudentDTO> presentStudents = new List <StudentDTO>();
foreach (var attendance in attendances)
{
presentStudents.Add(attendance.Student);
}
IEnumerable <StudentDTO> notPresentStudents = mentorsAllStudents.Except(presentStudents);
var viewModelData = new AddAttendeesViewData(notPresentStudents);
var viewModel = viewModelFactory.CreateView <AddAttendeesViewData, AddAttendeesViewModel>(viewModelData);
return(viewModel);
}
