app-engine-ndb

The only two answers on here involve essentially restructuring the database to accommodate this limitation, but I am unsure how to do that in my case. I have a list of thousands of contacts, each with many many properties. I'm making a page that has an ability to filter on multiple properties at once. For example: Age < 15, Date Added > 15 days ago, Location == Santa Cruz, etc. Potentially a ton of inequality filters required. How does one achieve this in GAE? According to the docs (for python) , Limitations: The Datastore enforces some restrictions on queries. Violating these will cause it to

I'm doing some work with Python and ndb and can't understand why. I'll post the cases and the code above: models.py class Reference(ndb.Model): kind = ndb.StringProperty(required=True) created_at = ndb.DateTimeProperty(auto_now_add=True) some_id = ndb.StringProperty(indexed=True) data = ndb.JsonProperty(default={}) Those tests are running in the Interactive console and --high_replication option to dev_appserver.py: Test 1 from models import Reference from google.appengine.ext import ndb import random some_id = str(random.randint(1, 100000000000000)) key_id = str(random.randint(1,

suppose I have this code: class A(ndb.Model): prop = ndb.StringProperty(verbose_name="Something") m = A() m.prop = "a string value" Now of course if I print m.prop, it will output "a string value" while in fact it's a StringProperty instance. So verbose_name can't be accessed the "normal" way, i.e m.prop._verbose_name . I read the code and found a way to access it: m._properties["prop"]._verbose_name , it works, but it looks hacky o_o. So tell me, is there another way to do it? Note: I'm talking about the NDB API, not the old one Use a class attribute: A.prop._verbose_name . Or m.__class__

Here's what I'm trying to do: the user submits a time in pacific, once submitted I use .replace to set the timezone to Pacific. Pacific = time.USTimeZone(-8, "Pacific", "PST", "PDT") addEvent.date = addEvent.date.replace(tzinfo=Pacific) Once i've set the tzinfo, I'm doing a put. According to the python documentation of google appengine it says: "If the datetime value has a tzinfo attribute, it will be converted to the UTC time zone for storage. Values come back from the datastore as UTC, with a tzinfo of None. An application that needs date and time values to be in a particular time zone must

I want to get an entity key knowing entity ID and an ancestor. ID is unique within entity group defined by the ancestor. It seems to me that it's not possible using ndb interface. As I understand datastore it may be caused by the fact that this operation requires full index scan to perform. The workaround I used is to create a computed property in the model, which will contain the id part of the key. I'm able now to do an ancestor query and get the key class SomeModel(ndb.Model): ID = ndb.ComputedProperty( lambda self: self.key.id() ) @classmethod def id_to_key(cls, identifier, ancestor):

I cant manage to get to 'previous page' in ndb paging. I have checked the documentation and also this similar question here without success. def show_feedback(kind, bookmark=None): """Renders returned feedback.""" cursor = None more_p= None if bookmark: cursor = Cursor(urlsafe=bookmark) q = Feedback.query() q_forward = q.filter(Feedback.kind==Feedback.KINDS[kind]).order(-Feedback.pub_date) q_reverse = q.filter(Feedback.kind==Feedback.KINDS[kind]).order(Feedback.pub_date) feedbacks, next_cursor, more = q_forward.fetch_page(app.config['FEEDBACK_PER_PAGE'], start_cursor=cursor) if cursor: rev