Question

I’m unable to workout how you can get objects from the Google App Engine Datastore using get_by_id. Here is the model

from google.appengine.ext import db  class Address(db.Model):   description = db.StringProperty(multiline=True)   latitude = db.FloatProperty()   longitdue = db.FloatProperty()   date = db.DateTimeProperty(auto_now_add=True) 

I can create them, put them, and retrieve them with gql.

address = Address() address.description = self.request.get('name') address.latitude = float(self.request.get('latitude')) address.longitude = float(self.request.get('longitude')) address.put() 

A saved address has values for

>> address.key() aglndWVzdGJvb2tyDQsSB0FkZHJlc3MYDQw >> address.key().id() 14 

I can find them using the key

from google.appengine.ext import db address = db.get('aglndWVzdGJvb2tyDQsSB0FkZHJlc3MYDQw') 

But can’t find them by id

>> from google.appengine.ext import db >> address = db.Model.get_by_id(14) 

The address is None, when I try

>> Address.get_by_id(14) AttributeError: type object 'Address' has no attribute 'get_by_id' 

How can I find by id?

EDIT: It turns out I’m an idiot and was trying find an Address Model in a function called Address. Thanks for your answers, I’ve marked Brandon as the correct answer as he got in first and demonstrated it should all work.

Answer 1

I just tried it on shell.appspot.com and it seems to work fine:

Google Apphosting/1.0 Python 2.5.2 (r252:60911, Feb 25 2009, 11:04:42)  [GCC 4.1.0]  >>> class Address(db.Model):   description = db.StringProperty(multiline=True)   latitude = db.FloatProperty()   longitdue = db.FloatProperty()   date = db.DateTimeProperty(auto_now_add=True)  >>> addy = Address() >>> addyput = addy.put() >>> addyput.id() 136522L >>> Address.get_by_id(136522) <__main__.Address object at 0xa6b33ae3bf436250>