DynamoDB returning Numbers as decimals not integers in Ruby

Question

I’m storing a few numbers in a Map. They’re being set correctly, and appear in DynamoDB interface correctly:

results List [1]
    0 Map
        dateTimeCompleted Number : 1554138543
        questionsAnswered Number : 10
        questionsCorrect Number : 5

However, when I get the response, using the AWS Ruby SDK, they’ve turned into decmimals.

"dateTimeCompleted"=>0.1554376141e10,
"questionsAnswered"=>0.2e2,
"questionsCorrect"=>0.5e1

Note this aren’t from the same item, so I’m aware the numbers don’t match, the format is the concern.

How do I tell the SDK that I’d like them as integers?

or

Do I need to map them in Ruby to integers myself?

score 1 · Accepted Answer · answered Apr 04 '19 at 11:32

1

Use to_i:

0.1554376141e10.to_i # => 1554376141

To convert all the values in a Hash:

my_hash.reduce({}) { |memo, (k,v)| memo[k] = v.to_i; memo }

or:

my_hash.transform_values(&:to_i)

answered Apr 04 '19 at 11:32

Kris

`transform_values` is a great shout, I was hoping for something that could be done at a DynamoDB level, but I think you might be the closest I can get to for now! – Zoe Edwards Apr 04 '19 at 13:31
Fortunately, floats can represent whole numbers exactly. – Stefan Apr 04 '19 at 14:21

1 Answers1