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columbus.py
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83 lines (63 loc) · 2.33 KB
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#
# Copyright 2008 The ndb Authors. All Rights Reserved.
#
# 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.
#
# Example from "Writing Property Subclasses".
from ndb import *
# Pay no attention to the testbed behind the curtain.
from google.appengine.ext import testbed
tb = testbed.Testbed()
tb.activate()
tb.init_datastore_v3_stub()
tb.init_memcache_stub()
from datetime import date
class FuzzyDate(object):
def __init__(self, first, last=None):
assert isinstance(first, date)
assert last is None or isinstance(last, date)
self.first = first
self.last = last or first
def __repr__(self):
return 'FuzzyDate(%r, %r)' % (self.first, self.last)
class FuzzyDateModel(Model):
first = DateProperty()
last = DateProperty()
class FuzzyDateProperty(StructuredProperty):
def __init__(self, **kwds):
super(FuzzyDateProperty, self).__init__(FuzzyDateModel, **kwds)
def _validate(self, value):
assert isinstance(value, FuzzyDate)
def _to_base_type(self, value):
return FuzzyDateModel(first=value.first, last=value.last)
def _from_base_type(self, value):
return FuzzyDate(value.first, value.last)
# Class to record historic people and events in their life.
class HistoricPerson(Model):
name = StringProperty()
birth = FuzzyDateProperty()
death = FuzzyDateProperty()
# Parallel lists:
event_dates = FuzzyDateProperty(repeated=True)
event_names = StringProperty(repeated=True)
# Record Christopher Columbus.
columbus = HistoricPerson(
name='Christopher Columbus',
birth=FuzzyDate(date(1451, 8, 22), date(1451, 10, 31)),
death=FuzzyDate(date(1506, 5, 20)),
event_dates=[FuzzyDate(date(1492, 1, 1), date(1492, 12, 31))],
event_names=['Discovery of America'])
columbus.put()
# Query for historic people born no later than 1451.
q = HistoricPerson.query(HistoricPerson.birth.last <= date(1451, 12, 31))
print q.fetch()