google-cloud-datastore

Let's say I have a model for my email address book: class contact(db.Model): email = db.EmailProperty() image = #Hmm. My contacts' images will be stored in the Blobstore, and served at various sizes. So, should I use a db.ReferenceProperty(BlobInfo) such that I can serve it by doing: get_serving_url(alice.image.key, size=x) Or should I use a db.StringProperty so that I don't have to make the second read in order to get the key: get_serving_url(alice.image, size=x) Or should I use a db.LinkProperty for the base URL, post-fixing the size needed: alice.image+'=sx' I don't foresee needing anything

I'm very used to SQL, and not the NoSQL paradigm of App Engine Datastore, so I had to write a piece of example code to understand how to do ancestor queries correctly. Thought I'd share it with you here; maybe it's interesting to someone. #!/usr/bin/env python # -*- coding: utf-8 -*- import webapp2 from google.appengine.ext.webapp.util import run_wsgi_app import logging from google.appengine.ext import db # MODELS class Child_model(db.Model): name = db.StringProperty() class Parent_model(db.Model): name = db.StringProperty() class Root_model(db.Model): pass # MAIN class MainHandler(webapp2

Is there any way to query GAE datastore with filter similar to SQL LIKE statement? For example, if a class has a string field, and I want to find all classes that have some specific keyword in that string, how can I do that? It looks like JDOQL's matches() don't work... Am I missing something? Any comments, links or code fragments are welcome As the GAE/J docs say, BigTable doesn't have such native support. You can use JDOQL String.matches for "something%" (i.e startsWith). That's all there is. Evaluate it in-memory otherwise. If you have a lot of items to examine you want to avoid loading