forms.py 文件源码

def clean(self):
        cleaned_data = self.cleaned_data
        slug = cleaned_data.get('slug', '')

        page = self.instance
        lang = cleaned_data.get('language', None)
        # No language, can not go further, but validation failed already
        if not lang:
            return cleaned_data
        parent = cleaned_data.get('parent', None)
        site = self.cleaned_data.get('site', Site.objects.get_current())
        if parent and parent.site != site:
            raise ValidationError("Site doesn't match the parent's page site")

        if site and not is_valid_page_slug(page, parent, lang, slug, site):
            self._errors['slug'] = ErrorList([_('Another page with this slug already exists')])
            del cleaned_data['slug']
        if self.instance and page.title_set.count():
            #Check for titles attached to the page makes sense only because
            #AdminFormsTests.test_clean_overwrite_url validates the form with when no page instance available
            #Looks like just a theoretical corner case
            title = page.get_title_obj(lang, fallback=False)
            if title and not isinstance(title, EmptyTitle) and slug:
                oldslug = title.slug
                title.slug = slug
                title.save()
                try:
                    is_valid_url(title.path, page)
                except ValidationError as exc:
                    title.slug = oldslug
                    title.save()
                    if 'slug' in cleaned_data:
                        del cleaned_data['slug']
                    if hasattr(exc, 'messages'):
                        errors = exc.messages
                    else:
                        errors = [force_text(exc.message)]
                    self._errors['slug'] = ErrorList(errors)
        return cleaned_data