Django error Art matching query does not exist.

Question

Good evening, guys. This is my first post on the forum and I’m also a little layman on Jango. I’m developing a project that involves a model called Art and in one of the views I need to update data. I did the whole part of the form and it arrives in the template, but when I click on the button to save the changes I am presented with the error Arte matching query does not exist.

Below follows the code of the view. If you need any more, I am available. Thanks in advance.

def editarte(request):
id_arte = request.GET.get("id")
arte = Arte.objects.get(id = id_arte)
formEditArte = EditArteModelForm(request.POST or None, instance = arte)
if request.method == 'POST':
    if formEditArte.is_valid():
        arte.save()
        return redirect('/editarte')

formEditArte = EditArteModelForm()
context = {
    'formEditArte' : formEditArte,
    'arte': arte
}
return render(request, 'editarte.html', context)

Answer 1

It is possible that the record you are trying to recover by id (id_arte) does not exist in the database. By the way then, you would like to check first if the record exists before you enter. If this is the case, put this code snippet into a block Try/except to treat the exception:

try:
   arte = Arte.objects.get(id = id_arte)
   // Atualiza o objeto existente
except Arte.DoesNotExist:
   // Cadastre o novo objeto