Python-сообщество

class ZayvkiAdminForm(ModelForm):
    class Meta:
        model = Zayvki
    def __init__(self, *args, **kwargs):
        # super(ZayvkiAdminForm, self).__init__(*args, **kwargs)
        if not kwargs.get('instance', None):
            if not kwargs.get('initial', None):
                kwargs['initial'] = {}
            if not kwargs['initial'].get('nomer_zayvki', None):
                kwargs['initial']['nomer_zayvki'] = get_request_number()
        super(ZayvkiAdminForm, self).__init__(*args, **kwargs)
        instance = getattr(self, 'instance', None)
        if instance and instance.id:
            self.fields['tipe_zayvki'].required = False
            self.fields['tipe_zayvki'].widget.attrs['disabled'] = 'disabled'
            self.fields['nomer_zayvki'].widget.attrs['readonly'] = True

def clean_tipe_zayvki(self):
    return self.instance.tipe_zayvki