CODEWITHSUNDEEP
pythonbotoamazon-dynamodb
Harlan
Harlan

Reputation: 19361

Boto DynamoDB error when using attributes_to_get in table.query

I've got a DynamoDB database set up with string hash key and range keys. This works:

>>> x = table.query(hash_key='[email protected]', range_key_condition=BEGINS_WITH("20"), 
    request_limit=5)
>>> [i for i in x]
[{u'x-entry-page': ...

This doesn't, and I can't figure out why not:

>>> x = table.query(hash_key='[email protected]', range_key_condition=BEGINS_WITH("20"), 
    attributes_to_get=[u'x-start-time'], request_limit=5)
>>> [i for i in x]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/boto-2.3.0-py2.7.egg/boto/dynamodb/layer2.py", line 588, in query
    yield item_class(table, attrs=item)
  File "/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/boto-2.3.0-py2.7.egg/boto/dynamodb/item.py", line 45, in __init__
    raise DynamoDBItemError('You must supply a hash_key')
boto.dynamodb.exceptions.DynamoDBItemError: BotoClientError: You must supply a hash_key

This makes very little sense to me. I clearly am supplying a hash key. I can't tell what the issue is just by looking at the Boto source. The attribute in question is definitely present in every record (not that that should throw an error).

Any suggestions? Thanks!

Upvotes: 1

Views: 678

Answers (2)

garnaat
garnaat

Reputation: 45846

Coincidentally, this was just fixed in boto earlier today. See:

https://github.com/boto/boto/issues/656

Upvotes: 2

Harlan
Harlan

Reputation: 19361

With the help of a colleague, we've got it figured out. The problem is that attributes_to_get requires the names of the hash and range keys. So, this works:

>>> x = table.query(hash_key='[email protected]', range_key_condition=BEGINS_WITH("20"), 
    attributes_to_get=[u'x-start-time', 'user_id', 'session_time'], request_limit=5)
>>> [i for i in x]
[{u'session_time': u'2012/04/18 09:59:20.247 -0400', u'user_id': u'[email protected]', 
    u'x-start-time': u'2012/04/18 09:59:20.247 -0400'}, ...

This seems like a (minor) Boto issue to me...

Upvotes: 2

Related Questions