app/soc/logic/models/ranker_root.py
author Lennard de Rijk <ljvderijk@gmail.com>
Fri, 24 Jul 2009 21:00:04 +0200
changeset 2678 a525a55833f1
parent 2160 3f9dd37d98a8
permissions -rw-r--r--
Send out a Notification upon creation of a new Request entity. The receivers are specified by the corresponding Role logic this Role Request is for. Currently Organization and Club Administrators will receive "new request" messages about respectively Mentor and Club Membership requests. Fixes Issue 442.

#!/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.

"""RankerRoot (Model) query functions.
"""

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

from google.appengine.api import datastore

from ranklist.ranker import Ranker

from soc.logic.models import base

import soc.models.ranker_root


class Logic(base.Logic):
  """Logic methods for the RankerRoot model.
  """

  def __init__(self, model=soc.models.ranker_root.RankerRoot, 
               base_model=None, scope_logic=None):
    """Defines the name, key_name and model for this entity.
    """

    super(Logic, self).__init__(model=model, base_model=base_model,
                                scope_logic=scope_logic)

  def create(self, name, scope, scores, branching_factor):
    """Creates a new RankerRoot with a new Ranker.

    Args:
      name: the Link ID of the ranker root
      scope: the entity owning the ranker
      score_range: A list showing the range of valid scores, in the form:
          [most_significant_score_min, most_significant_score_max,
          less_significant_score_min, less_significant_score_max, ...]
          Ranges are [inclusive, exclusive)
      branching_factor: The branching factor of the tree.  The number of
          datastore Gets is Theta(1/log(branching_factor)), and the amount of data
          returned by each Get is Theta(branching_factor). 

    """
    ranker = Ranker.Create(scores, branching_factor)

    fields = {'link_id': name,
        'scope': scope,
        'scope_path': scope.key().id_or_name(),
        'root': ranker.rootkey}

    key_name = self.getKeyNameFromFields(fields)
    self.updateOrCreateFromKeyName(fields, key_name)

  def getRootFromEntity(self, entity):
    """Returns a Ranker object created from a RankerRoot entity.

    Args:
      entity: A RankerRoot entity which the root should be retrieved of
    """

    return Ranker(datastore.Get(entity.key())['root'])


logic = Logic()