Django handle new ManyToManyField items with get_or_create()

Help me, django-users, you're my only hope :D

Hi all, my name is Filippo, I'm from Italy and I'm totally stuck on this problem...

I have a model with a ManyToManyField and in my view I want to be able to add new options to the generated selectbox.

How can I handle those new items with get_or_create function?

I want to check for form validity before saving it, but it will never be valid because I have to create all the new ManyToMany items. In the meantime, I don't want to add new items if the form is not valid...

So I'm stuck with this not-working-code:

def add_entry(request):      if request.method == 'POST':          form = EntryForm(data=request.POST)          model_instance = form.save(commit=False)          for tag in model_instance.tags.all():              t, created = Tag.objects.get_or_create(author=request.user, title=tag.title)              model_instance.tags.add(t)          if form.is_valid():              model_instance.save()              return HttpResponseRedirect("/")      else:          form = EntryForm()      return render_to_response(          'add_entry.html',          {'form' : form },          context_instance=RequestContext(request))

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