AWS Developer Tools Blog

Upcoming Stable Release of AWS SDK for Ruby – Version 2

We plan to release version 2 of the AWS SDK for Ruby next week. We will remove the preview flag from the 2.0 version of aws-sdk.

Specify Your Version Dependencies

The AWS SDK for Ruby uses semantic versioning. Updates within version 1 are backwards compatible.

Version 2 of the aws-sdk gem is not backwards compatible.

If you depend on the aws-sdk gem today, and do not specify the major version, please add this now. If not, you may run into issues when you bundle update.

# Gemfile
gem 'aws-sdk', '< 2.0'

# gemspec
spec.add_dependency('aws-sdk', '< 2.0')

NameError: uninitialized constant AWS

If you receive this error, you likely have a dependency on aws-sdk and have updated so that you now have version 2 installed. Version 2 uses a different module name, so it does not define AWS.

To resolve this issue, specify your version dependency as instructed above.

Using Both Versions

The following diagram shows how the version 1 and version 2 gems are organized.

The aws-sdk gem is empty, and simply requires version 1 or version 2 specific gems. This allows you to install version 1 and version 2 in the same application.

Option A, for existing users

# Gemfile
gem 'aws-sdk', '~> 1'
gem 'aws-sdk-resources', '~> 2'

# in code
require 'aws-sdk'
require 'aws-sdk-resources'

Option B, for new users

# Gemfile
gem 'aws-sdk-v1'
gem 'aws-sdk', '~> 2'

# in code
require 'aws-sdk-v1'
require 'aws-sdk'

Attention Library Authors

If you maintain a gem that has a dependency on version 1 of aws-sdk, I strongly recommend that you replace it with a dependency on aws-sdk-v1. This allows end users to require version 2 of aws-sdk.

Please report any issues you have on our GitHub repository.