The TitleManager already has public() and drafts() defined there, you can you that.
```python
class TitleManager(PublisherManager):
    def public(self):
        return self.get_query_set().filter(page__publisher_is_draft=False, page__published=True)

    def drafts(self):
        return self.get_query_set().filter(page__publisher_is_draft=True)
```