public IActionResult GetByRa(string ra)
        {
            var aluno = _alunoRepository.Find(ra);

            if (aluno == null)
            {
                return(NotFound());
            }
            return(new ObjectResult(aluno));
        }
 private List <Aluno> ObterListaAlunos()
 {
     return(_alunoRepository.Find(User.Identity.Name).ToList());
 }