A key_name controller module to collect all of the name...() functions that
compose Model entity key names, plus some minor changes to other controller
modules to illustrate the proposed use.
Patch by: Todd Larsen
Review by: Pawel Solyga
Review URL: http://codereviews.googleopensourceprograms.com/804
Review URL: http://codereviews.googleopensourceprograms.com/804
#!/usr/bin/python2.5
#
# Copyright 2008 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.
"""Helpers functions for updating different kinds of models in datastore.
"""
__authors__ = [
'"Pawel Solyga" <pawel.solyga@gmail.com>',
]
from google.appengine.ext import db
def updateModelProperties(model, **model_properties):
"""Update existing model entity using supplied model properties.
Args:
model: a model entity
**model_properties: keyword arguments that correspond to model entity
properties and their values
Returns:
the original model entity with any supplied properties changed
"""
def update():
return _unsafeUpdateModelProperties(model, **model_properties)
return db.run_in_transaction(update)
def _unsafeUpdateModelProperties(model, **model_properties):
"""(see updateModelProperties)
Like updateModelProperties(), but not run within a transaction.
"""
properties = model.properties()
for prop in properties.values():
if prop.name in model_properties:
value = model_properties[prop.name]
prop.__set__(model, value)
model.put()
return model