#!/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')