formsets_are_valid.py

# see http://groups.google.com/group/django-users/browse_thread/thread/259c1679ddaaceb8
# for the problem and http://code.djangoproject.com/ticket/12780 for the admin/options.py patch
# required to get this working

from django.forms.util import ErrorList

class ClipAdmin(admin.ModelAdmin):
    def formsets_are_valid(self, formsets, form, form_is_valid, instance,
            request):
        valid = super(ClipAdmin, self).formsets_are_valid(formsets,
                form, form_is_valid, instance, request)
        if not valid:
            return False

        is_approved = form.cleaned_data.get('is_approved')
        base_language = form.cleaned_data.get('language')
        valid = True

        if base_language and is_approved:
            # find the right formset
            clipdescription_formset = filter(
                    lambda fset: fset.__class__.__name__ == 'ClipDescriptionFormFormSet',
                    formsets)[0]
            valid = False
            for form_cleaned_data in clipdescription_formset.cleaned_data:
                # check for language matches in the formset
                language = form_cleaned_data.get('language')
                if language and language == base_language:
                    valid = True
                    break

            if not valid:
                msg = _("Cannot approve this clip without "
                        "having a description in English.")
                clipdescription_formset._non_form_errors = ErrorList([msg])

        return valid