alex/django-taggit — pull request #110 by tyrelsouza (2013-02-20 21:53:04+00:00)
Title: Being able to restrict adding tags to just the admin.

I added the ability to be able to limit a certain field to being only able to add formerly existing tags to a field's tag collection, rather than adding anything that doesn't exist. Completely optional parameter on the field setup like

```python
class DemoModel(models.model):
only_existing_tags = TaggableManager(restricted=True)
any_tags = TaggableManager()
```