Argument store added to updateEntityProperties.
This argument determines if an entity should be stored in the data model after its properties are updated.
It may be useful, for example, along with tasks (Task Queue API). One may want to make some modifications to an entity during execution of a task, but the developer is sure that at least one new task, which also wants to modify the entity, will be queued, so he or she can just update the entity without saving the changes to the data model, set the entity in memcache and the following task (which is to be executed very shortly) is to retrive the current entity from the memcache (without any expensive calls to the actual data model).
#!/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.
"""SurveyRecord (Model) query functions.
"""
__authors__ = [
'"Lennard de Rijk" <ljvderijk@gmail.com>',
]
from soc.logic.models import expando_base
from soc.models.survey_record import SurveyRecord
from soc.models.grading_project_survey_record import GradingProjectSurveyRecord
from soc.models.project_survey_record import ProjectSurveyRecord
class Logic(expando_base.Logic):
"""Logic methods for listing results for Surveys.
"""
def __init__(self, model=SurveyRecord,
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, id_based=True)
def updateOrCreateFromFields(self, entity, properties, clear_dynamic=False):
"""Create a new SurveyRecord, or update an existing one.
params:
entity: existing SurveyRecord, if one exists
properties: the properties to be set
clear_dynamic: iff True removes all dynamic properties before updating
"""
if entity:
if clear_dynamic:
# remove all dynamic properties before we update
for prop in entity.dynamic_properties():
delattr(entity, prop)
self.updateEntityProperties(entity, properties)
else:
entity = super(Logic, self).updateOrCreateFromFields(properties)
return entity
class ProjectLogic(Logic):
"""Logic class for ProjectSurveyRecord.
"""
def __init__(self, model=ProjectSurveyRecord,
base_model=SurveyRecord, scope_logic=None):
"""Defines the name, key_name and model for this entity.
"""
super(ProjectLogic, self).__init__(model=model, base_model=base_model,
scope_logic=scope_logic)
class GradingProjectLogic(ProjectLogic):
"""Logic class for GradingProjectSurveyRecord.
"""
def __init__(self, model=GradingProjectSurveyRecord,
base_model=ProjectSurveyRecord, scope_logic=None):
"""Defines the name, key_name and model for this entity.
"""
super(GradingProjectLogic, self).__init__(model=model,
base_model=base_model,
scope_logic=scope_logic)
logic = Logic()
project_logic = ProjectLogic()
grading_logic = GradingProjectLogic()