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−#!/usr/bin/python2.5
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−#
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−# Copyright 2008 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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−"""Notification (Model) query functions.
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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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−from soc.cache import sidebar
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−from soc.logic.helper import notifications
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−from soc.logic.models import base
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−from soc.logic.models import user as user_logic
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−
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−import soc.models.notification
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−
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−
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−class Logic(base.Logic):
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−  """Logic methods for the Notification model.
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−  """
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−
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−  def __init__(self):
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−    """Defines the name, key_name and model for this entity.
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−    """
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−    super(Logic, self).__init__(model=soc.models.notification.Notification,
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−         base_model=None, scope_logic=user_logic)
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−
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−  def _onCreate(self, entity):
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−    """Sends out a message if there is only one unread notification.
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−    """
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−
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−    # create a special query on which we can call count
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−    query = db.Query(self._model)
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−    query.filter('scope =', entity.scope)
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−    query.filter('unread = ', True)
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−
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−    # count the number of results with a maximum of two
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−    unread_count = query.count(2)
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−
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−    if unread_count == 1:
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−      # there is only one unread notification so send out an email
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−      notifications.sendNewNotificationMessage(entity)
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−
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−    super(Logic, self)._onCreate(entity)
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−
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−  def _updateField(self, entity, entity_properties, name):
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−    """If unread changes we flush the sidebar cache.
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−    """
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−
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−    value = entity_properties[name]
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−
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−    if (name == 'unread') and (entity.unread != value):
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−      # in case that the unread value changes we flush the sidebar.
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−      sidebar.flush(entity.scope.account)
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−
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−    return True
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−
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−
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−logic = Logic()