class PostIndex(indexes.SearchIndex, indexes.Indexable):
    text = indexes.CharField(document=True, use_template=True)
    thread = indexes.CharField(model_attr='thread')
    author = indexes.CharField(model_attr='author')
    is_approved = indexes.BooleanField(model_attr='is_approved')
    subject = indexes.EdgeNgramField(model_attr='subject')
    content = indexes.EdgeNgramField(model_attr='content')
    created = indexes.DateTimeField(model_attr='created_at')
    updated = indexes.DateTimeField(model_attr='updated_at')

    url = indexes.CharField(model_attr='get_absolute_url')

    def get_model(self):
        return Post

    def index_queryset(self, using=None):
        return self.get_model().objects.order_by('created_at')