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−#!/usr/bin/python2.5
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−#
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−# Copyright 2009 the Melange authors.
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−#
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−# Licensed under the Apache License, Version 2.0 (the "License");
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−# you may not use this file except in compliance with the License.
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−# You may obtain a copy of the License at
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−# 
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−#   http://www.apache.org/licenses/LICENSE-2.0
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−# 
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−# Unless required by applicable law or agreed to in writing, software
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−# distributed under the License is distributed on an "AS IS" BASIS,
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−# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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−# See the License for the specific language governing permissions and
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−# limitations under the License.
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−
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−"""This module contains the RankerRoot model
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−"""
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−
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−__authors__ = [
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−  '"Lennard de Rijk" <ljvderijk@gmail.com>',
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−]
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−
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−
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−from google.appengine.ext import db
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−
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−import soc.models.linkable
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−
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−
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−class RankerRoot(soc.models.linkable.Linkable):
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−  """Links the Root of a RankList tree to an owner and also 
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−     gives it an unique ID.
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−  """
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−
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−  #: A required reference property to the root of the RankList tree
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−  root = db.ReferenceProperty(required=True, collection_name='roots')