i'm starting with django-tagging and I don't understand why update_tags(object, new_tag) method replaces all existing tags on object by new_tag.
What is the proper way to append a tag to the existing tags on an object inside a views?
EDIT: add_tag function is not satifying becaus it doesn't enables you to add multiple words tags: see this former post
Use add_tag(object, tag_name).
For more information see http://api.rst2a.com/1.0/rst2/html?uri=http://django-tagging.googlecode.com/svn/trunk/docs/overview.txt#api-reference