def zrodlo_post_save(instance, *args, **kw):
    """Źródło zostało zapisane (post_save)
    """
    changed = getattr(instance, '_BPP_CHANGED_FIELDS', [])
    if not changed:
        changed = kw.get('update_fields') or []
    if 'skrot' in changed:
        from bpp.tasks import zaktualizuj_zrodlo
        zaktualizuj_zrodlo.delay(instance.pk)
