# forms.py
class ProfileForm(forms.ModelForm):

    city = forms.ModelChoiceField(queryset=City.objects.all())

    class Meta:
        model = Profile
        fields = ['country', 'region']

# views.py
def signup(request):
    message = ''

    if request.method == 'POST':
        pform = ProfileForm(request.POST)
        pform.is_valid()
        return HttpResponse('%s' % pform)
    else:
        ip = request.META.get('REMOTE_ADDR', '') or request.META.get(
            'HTTP_X_FORWARDED_FOR', '')
        info = get_ip_info(ip)
        region = Region.objects.filter(name__contains=info['region'])[0]
        city = City.objects.filter(name__contains=info['city'])[0]

        pform = ProfileForm(initial={
            'region': region.id,
            'city': city.id,
            'country': 1
        })
        pform.fields['city'].queryset = region.city_set.all()

    return render(request, 'authenticate/signup.html', {
        'pform': pform,
        'message': message,
    })

# models.py тот же