Hello, In Google App Engine, datastore modelling, I would like to ask how can I check for null value of a property with class UserProperty? for example: I have this code: class Entry(db.Model): title = db.StringProperty() description = db.StringProperty() author = db.UserProperty() editor = db.UserProperty() creationdate = db...
AppEngine 1.2.2. I define a class Product like so: @PersistenceCapable(identityType = IdentityType.APPLICATION, table="Products") public class Product { public Product(String title) { super(); this.title = title; } public String getTitle() { return title; } @Persistent String title; @PrimaryKey @Persistent(valueStrateg...
Possible Duplicate: creating a proxy site video75 can be used to search youtube videos in countres like turkey, where youtube is banned. I observered the request and response from video75 and saw that it ultimately streams the video from googlevideo cache . I tried to play a video on video75 and I saw that ultimatly video was ...
I have a large hierarchical dataset in the App Engine Datastore. The hierarchy is preserved by storing the data in Entity groups, so that I can pull a whole tree by simply knowing the top element key like so: query = db.Query().ancestor(db.get(key)) The question: How do I now output this data as JSON and preserve the hierarchy? Googl...
I'm experiencing a critical problem with my App Engine datastore, and it seems to be completely immune to debugging: I'm unable to modify entities after constructing them. The problem is even present when working from a console defined in app.yaml that does not share any code with my main application. Here's an example from the console...
It would be an enormous security flaw if it does. Proposed method: entity = db.get(key) source: http://code.google.com/appengine/docs/python/datastore/creatinggettinganddeletingdata.html#Getting%5Fan%5FEntity%5FUsing%5Fa%5FKey ...
While using django.core.paginator import ObjectPaginator, I'm getting this error: NeedIndexError: The built-in indices are not efficient enough for this query and your data. Please add a composite index for this query. The original query is written in this form: query = models.Cdr.all() query.filter("var1 =", var1 ) query.fi...
I tried adding batches of data in a list with a couple of calls to db.put(). But it still timeouts occasionally. Anyone have some tips? ...
Hi all, I would like to ask if there is any tools for Google App Engine to edit datastore in localhost? In the Application Console, I can edit data on appspot, but for localhost, which tools are available? Please advice! ...
When I update an entity, the entity needs to change parent, is there any way to do that? ...
What is the best way to migrate MySQL tables to Google Datastore and create python models for them? I have a PHP+MySQL project that I want to migrate to Python+GAE project. So far the big obstacle is migrating the tables and creating corresponding models. Each table is about 110 columns wide. Creating a model for the table manually i...
I am trying to figure out the best way to deploy a single google app engine application across multiple regions. The same code is to be used, but the stored data is specific to each region. Motivating examples are hyperlocal review sites, like yelp.com or urbanspoon, where restaurants and other businesses to review are specific to a re...
Hi! I tried User(email = email) and User.all().filter('email = ', email).get(), but both of them don't work for me. Thanks ...
I'm using GoogleAppEngineLauncher (GAEL) on Mac OS X. The state of the datastore for my application is persisted between server restarts and even GAEL restarts, but if I reboot, the datastore is reset. Is there a setting to prevent this reset, or is there a tmp file somewhere that I can save off? ...
The objective is to reduce the CPU cost and response time for a piece of code that runs very often and must db.get() several hundred keys each time. Does this even work? Can I expect the API time of a db.get() with several hundred keys to reduce roughly linearly as I reduce the size of the entity? Currently the entity has the followi...
Hi, I've watched this video from Google I/O 2009: http://www.youtube.com/watch?v=AgaL6NGpkB8 where Brett shows microblogging example. He describes two datastore schemas: first one: class Message(db.Model): sender = db.StringProperty() body = db.TextProperty() receivers = db.StringListProperty() and second one: class Messag...
Hi, Am wondering if anyone can provide some guidance on how I might implement a starts with or ends with query against a Datastore model using Python? In pseudo code, it would work something like... Query for all entities A where property P starts with X or Query for all entities B where property P ends with X Thanks, Matt ...
Original Design Here's how I originally had my Models set up: class UserData(db.Model): user = db.UserProperty() favorites = db.ListProperty(db.Key) # list of story keys # ... class Story(db.Model): title = db.StringProperty() # ... On every page that displayed a story I would query UserData for the current user:...
@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable ="false") public class Foo implements IsSerializable { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent private Long revision; @Persistent private String information; } The problem is this obje...
This is why I need to put user_id()'s in the Datastore: A User value in the datastore does not get updated if the user changes her email address. This may be remedied in a future release. Until then, you can use the User value's user_id() as the user's stable unique identifier. http://code.google.com/appengine/docs/pyt...