public void approveAssistantRequest(UserRequest request, Person evaluator) {
   AcademicController ac = new AcademicController();
   Role role = ac.searchRoleByConstant(Constants.MONITOR);
   PersonRoleCourse prc = this.searchPersonRoleCourse(request.getPerson(), request.getCourse());
   if (prc != null) {
     this.deletePersonRoleCourse(prc);
   }
   PersonRoleCourse prcc = new PersonRoleCourse();
   prcc.setCourse(request.getCourse());
   prcc.setPerson(request.getPerson());
   prcc.setRole(role);
   prcc.setDate(new Date());
   this.updatePersonRoleCourse(prcc);
 }
 public void requestAssistance(UserRequest userRequest) throws RequestException {
   List<UserRequest> results =
       searchRequestByUserID(userRequest.getCourse().getId(), userRequest.getPerson().getId());
   for (UserRequest request : results) {
     if (request.getStatus().equalsIgnoreCase("ag")) {
       throw new RequestException("errors.request.waiting");
     }
     if (request.getStatus().equalsIgnoreCase("ap")) {
       throw new RequestException("errors.request.approved");
     }
   }
   userRequest.setStatus("ag");
   insertUserRequest(userRequest);
 }