Problems when obtaining an id, sent by a form

[cosmos multi]

Good evening, I am trying to get the id of my model Note that is sent by means of a form, but when I put form.id it tells me that id is not defined, try to get it through the user session but it says that it was not found.

def add_book(request):

template_name = 'books/create_note.html'

book = get_or_create_book(request)

form = NoteForm(request.POST)

if request.method == 'POST' and form.is_valid():

note = Note.objects.get(pk=form.pk)

book.notes.add(note)

form.save()

return redirect('books:book')

return render(request, template_name, {

'form': form,

})

and the form is

class NoteForm(ModelForm):

class Meta:

model = Note

fields = (

'title', 'nota'

)

labels = {

'title': 'Titulo',

'nota': 'Nota',

}