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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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−"""User (Model) query functions.
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−"""
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−
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−__authors__ = [
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−  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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−  ]
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−
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−
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−from soc.logic.models import base
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−
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−import soc.models.user
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−
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−
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−class Logic(base.Logic):
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−  """Logic methods for the User 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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−    base.Logic.__init__(self, soc.models.user.User,
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−                        skip_properties=['former_accounts'])
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−
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−  def isFormerAccount(self, account):
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−    """Returns true if account is a former account of some User.
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−    """
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−    # TODO(pawel.solyga): replace 1000 with solution that works for any number of queries
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−    users_with_former_accounts = soc.models.user.User.gql(
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−        'WHERE former_accounts != :1', None).fetch(1000)
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−    
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−    for former_account_user in users_with_former_accounts: 
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−      if account in former_account_user.former_accounts:
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−        return True
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−    
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−    return False
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−
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−  def getKeyValues(self, entity):
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−    """See base.Logic.getKeyValues.
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−    """
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−
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−    return [entity.link_name]
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−
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−  def getSuffixValues(self, entity):
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−    """See base.Logic.getSuffixValues.
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−    """
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−
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−    return [entity.link_name]
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−
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−  def getKeyValuesFromFields(self, fields):
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−    """See base.Logic.getKeyValuesFromFields.
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−    """
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−
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−    return [fields['link_name']]
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−
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−  def getKeyFieldNames(self):
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−    """See base.Logic.getKeyFieldNames.
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−    """
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−
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−    return ['link_name']
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−
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−  def updateOrCreateFromAccount(self, properties, account):
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−    """Like updateOrCreateFromKeyName, but resolves account to key_name first.
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−    """
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−
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−    # attempt to retrieve the existing entity
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−    user = soc.models.user.User.gql('WHERE account = :1', account).get()
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−    
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−    if user:
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−      key_name = user.key().name()
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−    else:
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−      raise
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−      key_name  = self.getKeyNameForFields({'link_name': properties['link_name']})
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−
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−    return self.updateOrCreateFromKeyName(properties, key_name)
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−
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−  def _updateField(self, model, name, value):
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−    """Special case logic for account.
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−
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−    When the account is changed, the former_accounts field should be appended
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−    with the old account.
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−    """
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−    if name == 'account' and model.account != value:
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−      model.former_accounts.append(model.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()