Add support for prefetching fields
This makes it possible to specify the fields that should be
prefetched as part of a getForFields query. Doing a prefetch on a
ReferenceProperty when it is known that the property will be
referenced in (almost all) entities is far more efficient than
doing the invididual fetches sequentially.
#!/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.
"""Club Application (Model) query functions.
"""
__authors__ = [
'"Lennard de Rijk" <ljvderijk@gmail.com>',
]
from soc.logic.models import group_app
import soc.models.club_app
import soc.models.group_app
class Logic(group_app.Logic):
"""Logic methods for the Club Application model.
"""
def __init__(self, model=soc.models.club_app.ClubApplication,
base_model=soc.models.group_app.GroupApplication,
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 getKeyValuesFromEntity(self, entity):
"""See base.Logic.getKeyNameValues.
"""
return [entity.link_id]
def getKeyValuesFromFields(self, fields):
"""See base.Logic.getKeyValuesFromFields.
"""
return [fields['link_id']]
def getKeyFieldNames(self):
"""See base.Logic.getKeyFieldNames.
"""
return ['link_id']
logic = Logic()