id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
8795	bug in form validation	anihrat@…	nobody	"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



"		new	Forms	dev					Unreviewed	0	0	0	0	0	0