CODEWITHSUNDEEP
pythongoogle-app-enginegoogle-cloud-datastore
Remco Haszing
Remco Haszing

Reputation: 7809

ndb.get_multi(keys) returns an array of None

I want to get some data from the Google Appengine ndb. I have the following code

keys = []
for field in self.request.arguments():
    keys.append(ndb.Key(models.MyModel, int(id)))

# Some unrelevant code

for k in keys:
    logging.info(k)

m = ndb.get_multi(keys)
for p in m:
    logging.info(p)

This gives me this output:

INFO     2012-09-07 13:18:23,436 main.py:58] Key('MyModel', 42)
INFO     2012-09-07 13:18:23,436 main.py:58] Key('MyModel', 44)
INFO     2012-09-07 13:18:23,437 main.py:58] Key('MyModel', 42)
INFO     2012-09-07 13:18:23,437 main.py:58] Key('MyModel', 43)
INFO     2012-09-07 13:18:23,437 main.py:58] Key('MyModel', 44)
INFO     2012-09-07 13:18:23,443 main.py:62] None
INFO     2012-09-07 13:18:23,443 main.py:62] None
INFO     2012-09-07 13:18:23,443 main.py:62] None
INFO     2012-09-07 13:18:23,443 main.py:62] None
INFO     2012-09-07 13:18:23,444 main.py:62] None

I'm sure the models exist in the datastore with that id number. So what am I doing wrong?

Upvotes: 2

Views: 1571

Answers (1)

Rob Curtis
Rob Curtis

Reputation: 2265

The id could be a string in your datastore. So Key('MyModel', '42') may be what you're looking for. Id's can be strings or integers. Here are the docs for further reading.

Edit: Do your MyModel entities have parent keys? If yes, then you'd need to include the parent when constructing the key.

Upvotes: 3

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