/
__init__.py
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/
__init__.py
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#!/usr/bin/env python
#
# Copyright 2012 Ezox Systems LLC
#
# 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.
#
from google.appengine.ext import ndb
class EntityBase(ndb.Model):
# The entity's change revision counter.
revision = ndb.IntegerProperty('r_', default=0)
# Useful timestamps.
added = ndb.DateTimeProperty('a_', auto_now_add=True)
modified = ndb.DateTimeProperty('m_', auto_now=True)
def _pre_put_hook(self):
"""Ran before the entity is written to the datastore.
It is possible to "skip" revisions due to contention.
"""
self.revision += 1
def _default_dict(self):
return {
'key': self.key.urlsafe(),
'revision': self.revision,
'added': self.added.strftime('%Y-%m-%d %H:%M'), # TODO: Standardize
'modified': self.modified.strftime('%Y-%m-%d %H:%M'), # TODO: Standardize
}