映射“ M”类型的dynamodb boto put_item

Question

Has anyone successfully performed a put operation of a map into dynamodb using boto (python)?

I basically need to put a json object. So far I have only been able to put it as json string but I cannot find an example of inserting a map anywhere.

Thanks a lot.

Answer 1

Since it does not looks like boto supports JSON in its high-level API interface, you have to use the low-level API interface and annotate your JSON object into a DynamoDB-supported wire format as such:

"time": {
    "M": {
      "creation_timestamp_utc": {
        "S": "2012-08-31T03:35:56.881Z"
      },
      "localtime": {
        "S": "12:25:31"
      },
      "received_timestamp_utc": {
        "S": "2012-08-31T07:50:50.367Z"
      },
      "spacecraft_clock": {
        "S": "399657440.746"
      }
    }

In the above snippet, M is used to denote a "map" object, and S is used to denote the attribute type of each of the entries. You can find more information on what annotations to use for each type here .

I can understand why this is extremely annoying to do though, so you could always open an issue (perhap there is already one opened) at https://github.com/boto/boto/issues/new so they are aware of the feature request.

Answer 2

Support for Maps and Lists is now available in boto v2.35: https://github.com/boto/boto/issues/2737

To upgrade: pip install -U boto