@RequestMapping(value = "/classmates", method = RequestMethod.GET)
  public String getClassmates(Model model) {
    User user = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    model.addAttribute("current_user", user);
    Student currentStudent = studentService.getOne(user.getId());

    if (user.getRole().equals(Role.ROLE_STUDENT))
      model.addAttribute("homework", currentStudent.getGroup().getHomeworks());

    TreeMap<Double, String> studentsMap = new TreeMap<>(Collections.reverseOrder());
    currentStudent
        .getGroup()
        .getStudents()
        .forEach(
            student ->
                studentsMap.put(
                    studentService.getAverageScore(student.getId()), student.getFullName()));

    LinkedHashMap<String, String> studentsMapForFreemarker = new LinkedHashMap<>();

    studentsMap
        .entrySet()
        .forEach(
            entry ->
                studentsMapForFreemarker.put(String.valueOf(entry.getKey()), entry.getValue()));

    model.addAttribute("studentsMap", studentsMapForFreemarker);
    return "student/classmates";
  }
 @RequestMapping(value = "/create", method = RequestMethod.POST)
 public ResponseEntity<String> createHomework(HttpServletRequest request) {
   User currentTeacher =
       (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
   if (homeworkService.saveHomework(request, currentTeacher.getId())) {
     return ResponseEntity.ok("Домашняя работа была добавлена");
   } else {
     return ResponseEntity.status(HttpStatus.BAD_REQUEST)
         .body("Проверьте правильность заполнения полей");
   }
 }
  @RequestMapping(value = "/marks", method = RequestMethod.GET)
  public String getMarks(Model model) {
    User user = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    model.addAttribute("current_user", user);
    Student currentStudent = studentService.getOne(user.getId());

    if (user.getRole().equals(Role.ROLE_STUDENT))
      model.addAttribute("homework", currentStudent.getGroup().getHomeworks());

    model.addAttribute("marks", firstTenMarks(currentStudent.getMarks()));
    return "student/marks";
  }
  @RequestMapping(value = "/schedule", method = RequestMethod.GET)
  public String getSchedule(Model model) {
    User user = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    model.addAttribute("current_user", user);
    Student currentStudent = studentService.getOne(user.getId());

    if (user.getRole().equals(Role.ROLE_STUDENT))
      model.addAttribute("homework", currentStudent.getGroup().getHomeworks());

    List<SchoolDay> schoolDays =
        new ArrayList<>(studentService.getSchedule(currentStudent).getSchoolDays());
    Collections.sort(schoolDays);
    model.addAttribute("schoolDays", schoolDays);
    return "student/schedule";
  }