class MyModel(Model):
    rating = IntegerProperty()
    timestamp = IntegerProperty()

MyModel.all().filter('timestamp <', 100).order('-rating')

class TopPager(Pager):
    '''Paginator for TOP of content
    '''
    
    def __init__(self, query, days, **kw):
        super(TopPager, self).__init__(query, **kw)
        self.days = days
    
    @property
    def results(self):
        is_dirty = True
        while is_dirty:
            is_dirty = False
            page = super(TopPager, self).results
            for item in page:
                if not (datetime.utcnow() - item.date).days < self.days:
                    item.put()
                    is_dirty = True
        return page

    @db.ComputedProperty
    def top_24h(self):
        return _since_days(self.date, 1)
        
    @db.ComputedProperty
    def top_7d(self):
        return _since_days(self.date, 7)
        
    @db.ComputedProperty
    def top_30d(self):
        return _since_days(self.date, 30)