'Returns the number of questions asked in the last 24 hours.'

@classmethod
def recent_asked_count(cls, extra_filter=None):

    start = (datetime.now() - timedelta(hours=24))
    qs = cls.objects.filter(created__gt=start, creator__is_active=True)
    if extra_filter:
        qs = qs.filter(extra_filter)
    return qs.count()
