AWS Developer Tools Blog

AWS SDK Core v2.0.0.rc12 Updates

We recently published v2.0.0.rc12 of the aws-sdk-core gem ( This release merges the long-running normalized branch onto master.

Upgrading Notes

Please note, when updating to rc12, you may need to make some minor code changes. These are summarized below:

  • Service modules now have a Client class, these should be used to construct API clients:

    # deprecated, will be removed for 2.0.0 final
    s3 =
    # preferred
    s3 =

    Looking forward to the resources update, this will ensure we have a suitable namespace for the new resource classes. Look for more information in a follow up blog post.

  • The Amazon SimpleDB client class has been renamed from Aws::SDB to Aws::SimpleDB. This also affects the short name used in configuration:

    # old configuration key
    Aws.config[:sdb] = { ... }
    # new key
    Aws.config[:simpledb] = { ... }
  • The :raw_json configuration option has been renamed to :simple_json. This is used for services that use the JSON protocol.

Less Visible Changes

If you have written plugins for the aws-sdk-core gem, there are a few other changes to the internals you need to be aware of.

  • Seahorse::Model has received significant updates, especially the API model format. This new format is much more flexible than the denormalized format used previously. Additionally, the AWS API models are now consumed as-is without translation. See the API reference for more information.

  • Seahorse::Client::Http::Request#endpoint is now URI::HTTPS or URI::HTTP object. The custom Endpoint class has been removed in favor of these objects provided by the Ruby standard library.

  • Seahorse::Client::HandlerList#add no longer accepts instance objects and requires a handler class that can be constructed.