CODEWITHSUNDEEP
pythongoogle-app-engine
rocketboy2000
rocketboy2000

Reputation: 119

google app engine python get_by_id does not function

first time post and new to google app engine!

i can't for the life of me figure out why my attempts to access an object using Model.get_by_id does not function.

my test data is populated and i can verify the output as commented. i can confirm the ID of the data in the Datastore viewer... but attempts to use that ID fail to return the object.

    namespace_manager.set_namespace('myNamespace')

    for t in models.MyClass.all().fetch(100):
        print t.key().id() # prints the key and verified in the Datastore Viewer
        print t.date # prints the date

        myClassInstance = models.MyClass.get_by_id(t.key().id()) # never finds the object
        if tour is None:
            print "MyClass instance not found"

so output is

    6
    2012-04-24 20:47:13.537000
    MyClass instance not found
    27
    2012-04-24 20:47:13.605000
    MyClass instance not found
    29
    2012-04-24 20:47:13.611000
    MyClass instance not found
    31
    2012-04-24 20:47:13.617000
    MyClass instance not found

note that this is not a root entity and has children as well... but shouldn't the MyClass.get_by_id method return the correct object?

thanks in advance!

Upvotes: 0

Views: 466

Answers (1)

aschmid00
aschmid00

Reputation: 7158

if you are creating your entities with a parent/ancestor you need to provide that to the get_by_id function too.

entity = MyModel(parent = parentkey,
                 name   = 'somename')
entity.put()

entity_by_id = MyModel.get_by_id(entity.key().id(), parent = parentkey)

Upvotes: 3

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