bug in form validation

[anihrat@…]

i found this bug

when you have model like this:

class FunkcjeProdukt(models.Model):
    funkcja = models.ForeignKey(FunkcjeRodzina)
    produkt = models.ForeignKey(Produkty)
    wartosc = models.CharField(max_length=255)
    class Meta:
        unique_together = ("produkt", "funkcja")

and form from model:

class FunkcjeProduktForm(ModelForm):
    wartosc = forms.CharField(widget=forms.TextInput(attrs={'size':'40','class':'formularz'}))
    class Meta:
        model = FunkcjeProdukt
        exclude=('produkt','funkcja')

end if you want only edit "wartosc" from existing instance:

form_fp = FunkcjeProduktForm(data=request.POST,instance=finst)
if form_fp.is_valid():
       form_fp.save()

error is throw:

KeyError at /cms/r_produkt/8/'produkt'
Request Method:    POST
Request URL:    http://posiflex.com.pl/cms/r_produkt/8/
Exception Type:    KeyError
Exception Value:    'produkt'
Exception Location:    /home/posiflex/django/forms/models.py in validate_unique, line 238

because:
in validate_unique() from django/forms/models.py
line unique_checks = list(self.instance._meta.unique_together[:])
add 'produkt' and 'funkcja' even when this fields in on exclude list

[Marc Fargas]

Rewrote Description to hightlight code and not mess with it.