# Copyright 2015 Google Inc.
#
# 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.
"""Cloud Datastore NDB API guestbook sample.
This sample is used on this page:
https://cloud.google.com/appengine/docs/python/ndb/
For more information, see README.md
"""
# [START gae_ndb_overview]
import cgi
import textwrap
import urllib
from google.appengine.ext import ndb
import webapp2
# [START gae_ndb_overview_greeting]
class Greeting(ndb.Model):
"""Models an individual Guestbook entry with content and date."""
content = ndb.StringProperty()
date = ndb.DateTimeProperty(auto_now_add=True)
# [END gae_ndb_overview_greeting]
# [START gae_ndb_overview_query]
@classmethod
def query_book(cls, ancestor_key):
return cls.query(ancestor=ancestor_key).order(-cls.date)
class MainPage(webapp2.RequestHandler):
def get(self):
self.response.out.write("")
guestbook_name = self.request.get("guestbook_name")
ancestor_key = ndb.Key("Book", guestbook_name or "*notitle*")
greetings = Greeting.query_book(ancestor_key).fetch(20)
# [END gae_ndb_overview_query]
greeting_blockquotes = []
for greeting in greetings:
greeting_blockquotes.append(
"%s
" % cgi.escape(greeting.content)
)
self.response.out.write(
textwrap.dedent(
"""\
{blockquotes}
"""
).format(
blockquotes="\n".join(greeting_blockquotes),
sign=urllib.urlencode({"guestbook_name": guestbook_name}),
guestbook_name=cgi.escape(guestbook_name),
)
)
# [START gae_ndb_overview_submit]
class SubmitForm(webapp2.RequestHandler):
def post(self):
# We set the parent key on each 'Greeting' to ensure each guestbook's
# greetings are in the same entity group.
guestbook_name = self.request.get("guestbook_name")
greeting = Greeting(
parent=ndb.Key("Book", guestbook_name or "*notitle*"),
content=self.request.get("content"),
)
greeting.put()
# [END gae_ndb_overview_submit]
self.redirect("/?" + urllib.urlencode({"guestbook_name": guestbook_name}))
app = webapp2.WSGIApplication([("/", MainPage), ("/sign", SubmitForm)])
# [END gae_ndb_overview]