public ActionResult TeacherStudentsAndGrades(int?teacherId)
{
if (teacherId == 0 || !teacherId.HasValue)
{
return(RedirectToAction("Index"));
}
teacherService = new TeacherService();
studentService = new StudentService();
Teacher teacher = teacherService.getCorrespondingTeacher((int)teacherId);
if (teacher == null)
{
return(RedirectToAction("Index"));
}
IEnumerable <StudentSubject> teacherStudentSubjects = teacherService
.GetTeacherStudentSubjectsByTeacherId((int)teacherId);
if (teacherStudentSubjects.Count() == 0)
{
return(RedirectToAction("Index"));
}
IEnumerable <Student> teachersStudents = studentService
.GetStudentsByStudentSubjects(teacherStudentSubjects.ToList());
if (teachersStudents.Count() == 0)
{
return(RedirectToAction("Index"));
}
IEnumerable <Subject> teachersSubjects = teacherService
.GetTeachersSubjectsFromTeachersStudentSubjectList(teacherStudentSubjects);
if (teachersSubjects.Count() == 0)
{
return(RedirectToAction("Index"));
}
List <TeacherStudentsAndGradesViewModel> viewModel = teacherService
.CreateTeacherStudentsAndGradesViewModel(teacher, teacherStudentSubjects, teachersStudents,
teachersSubjects);
return(View(viewModel));
}