from functools import wraps

def extra_author_field(view):
    """
    This decorator should be used in conjunction with the newforms
    create_update views. It adds "request.user" in the "extra_fields" dict.
    """
    @wraps(view)
    def wrapper(*args, **kwargs):
        request = args[0]
        kwargs.setdefault('extra_fields', {}).update({'author' : request.user})
        return view(*args, **kwargs)
    return wrapper



#### urls.py (extract only) ####

"""This decorator can be used as shown below"""

url(r'^add/$',
    # here we use both the permission_required and my new extra_author_field decorator
    permission_required('news.add_news')(extra_author_field(create_object)),
    {
        'model' : News,
        'model_form' : NewsForm,
        'login_required' : True,
    },
),