Rails 4 S3 Paperclip initializer

initializer_paperclip.rb

# Gemfile
# gem "aws-sdk"
# gem 'paperclip', :git=> 'https://github.com/thoughtbot/paperclip', :ref => '523bd46c768226893f23889079a7aa9c73b57d68'


# config/initializers/paperclip.rb

Paperclip::Attachment.default_options.update({
    storage: :s3,
    s3_protocol: 'https',

    s3_credentials: {
        s3_region: Rails.application.secrets.s3('AWS_REGION'),
        bucket: Rails.application.secrets.s3('AWS_BUCKET'),
        access_key_id: Rails.application.secrets.s3('AWS_ACCESS_KEY_ID'),
        secret_access_key: Rails.application.secrets.s3('AWS_SECRET_ACCESS_KEY')
    }
})

# You can also specify per media:
# in some model...
  has_attached_file :video,
                    storage: :s3,
                    s3_protocol: 'https',
                    s3_credentials: {
                      s3_region: Rails.application.secrets.s3['AWS_REGION'],
                      bucket: Rails.application.secrets.s3["AWS_S3_BUCKET"], # base the bucket on environment
                      access_key_id: Rails.application.secrets.s3["AWS_ACCESS_KEY_ID"],
                      secret_access_key: Rails.application.secrets.s3["AWS_SECRET_ACCESS_KEY"]
                    },
                    path: "apps/project_name/public/system/model_name/:id/:attachment/:style.:extension"