@expose()
@require(is_anonymous(msg='Only one account per user is ' \
                          'allowed'))
def add_user(self, username, fullname, email, passwd):
    # Defining the row
    user = model.User()
    user.user_name = username
    user.display_name = fullname
    user.email_address = email
    user.password = passwd
    # Including her in the "posters" group:
    query = DBSession.query(model.Group)\
            .filter(model.Group.group_name==u'posters')
    posters = query.one()
    posters.users.append(user)
    # Saving the row:
    DBSession.add(user)
    # Redirecting to the login form with a notification
    # message:
    flash('Account created! Please log in')
    redirect(url('/login'))