def add_existing_tag(tag_name, tag_manager):
 tag = Tag.objects.get(name__iexact=tag_name)
 tag_manager.add(tag)
 return tag.name

def add_existing_tag ( tag_name , tag_manager ) : tag = Tag . objects . get ( name__iexact = tag_name ) tag_manager . add ( tag ) return tag . name
add a tag that already exists to an object .