How, after a POST request, to insert values into another table automatically with the Entity Framework

Question

Good night! I have the following question: I have 3 tables (Students, Etapasala, Classroom)

As you can see, Etapasala is a connecting table between the student and the classroom. I’m using the MVC structure with Entity Framework, I’ve crud the 3 tables and everything works correctly. The problem is that I did not want to have to go in the View of Etapasala to link a student in your class at a certain stage and nor put a dropdown in the student’s registration for such, I would like to do this automatically at the time that POST request the student, link it to a room in step 1 and another room in step 2.

Follow the code of the POST method of Alunoscontroller:

// POST: Alunos/Create
    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Create([Bind("IdAluno,Nome,Sobrenome")] Aluno aluno)
    {
        if (ModelState.IsValid)
        {
            _context.Add(aluno);
            await _context.SaveChangesAsync();
            return RedirectToAction(nameof(Index));
        }
        return View(aluno);
    }

Model de Etapasala:

public partial class EtapaSala
{ 

    public int IdEtapa { get; set; }
    public int? Etapa { get; set; }
    public int? IdAluno { get; set; }
    public int? IdSala { get; set; }

    public virtual Aluno IdAlunoNavigation { get; set; }
    public virtual Sala IdSalaNavigation { get; set; }
}