#!/usr/bin/python2.5
#
# Copyright 2009 the Melange authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""This module contains the RankerRoot model
"""

__authors__ = [
  '"Lennard de Rijk" <ljvderijk@gmail.com>',
]


from google.appengine.ext import db

import soc.models.linkable


class RankerRoot(soc.models.linkable.Linkable):
  """Links the Root of a RankList tree to an owner and also 
     gives it an unique ID.
  """

  #: A required reference property to the root of the RankList tree
  root = db.ReferenceProperty(required=True, collection_name='roots')
