public IActionResult GetAllSpecialties()
        {
            var filterViewModel = new FilterViewModel();
            var specialties     = _specialtyService.GetAllSpecialties();

            filterViewModel.Specialties = specialties.Select(x => _mapper.Map <Specialty, SpecialtyViewModel>(x))
                                          .Select(x => new SelectListItem(x.Name, x.SpecialtyId.ToString()));
            return(View(filterViewModel));
        }