Save comment.id to another object - django

Question

I want to save in my database the comment id which has been commented. For that I have two models: Comentario and Pregunta. Look below:
models.py
class Comentario (models.Model):
titulo = models.CharField(max_length=50)
texto = models.CharField(max_length=200)
autor = models.ForeignKey (Perfil, null=True, blank=True, on_delete=models.CASCADE)
fecha_publicacion = models.DateTimeField(auto_now_add=True)
tag = models.ManyToManyField(Tags, blank=True)
def __str__(self):
return (self.titulo)
class Pregunta (models.Model):
descripcion = models.CharField(max_length=150)
autor = models.ForeignKey (Perfil, null=True, blank=True, on_delete=models.CASCADE)
fecha_pregunta = models.DateTimeField(auto_now_add=True)
comentario_preguntado = models.ForeignKey(Comentario, null=True, blank=True, related_name="pregunta_set")
def __str__(self):
return (self.descripcion)
When a comment is commented I want to save the 'comentario' id as 'comentario_preguntado' id. For that I have created the next view:
views.py
def ComentarioListar2 (request):
aa=Puesto.objects.filter(nombre_puesto=request.user.nom_puesto).values_list('etiquetas')
bb=Tags.objects.filter(id__in=aa)
objects=Comentario.objects.filter(tag__in=bb).exclude(autor__id=request.user.id)
form = preguntaform(request.POST or None)
if request.method == 'POST' and form.is_valid():
form.instance.autor = request.user
form.instance.comentario_preguntado=request.comentario.id
form.save()
return render(request, 'home/comentario_listar.html', {'objects': objects, 'form': form})
urls.py
urlpatterns = [
url(r'^listar2$', views.ComentarioListar2, name="listar2"),
]
But I obtain this error "ComentarioListar2() missing 1 required positional argument: 'Comentario_id'"
I do not know how to save in the comentario_preguntado id the id of the comment it is commented (comentario_id).
thank you for your help

Answer 1

Your URL needs to be declared so that the primary key of the model instance can be referred to from the view.
It should be like this:
url(r'^listar2/(?P<Comentario_id>[0-9]+)/$', views.ComentarioListar2, name="listar2"),
So, an example of the URL would be /listar2/101/. Where 101 is the ID of your Comentario model instance.
Then, you can access it in the view with the function you have defined:
def ComentarioListar2 (request, Comentario_id):
^^^^^^^