RUBY: Move AWS S3 Paperclip files using a non-standard region (i.e. not us-east-1)

move_s3_files.rb

# I had issues with moving S3 files in a non-standard region, such as London 
# (eu-west-2). The AWS docs don't seem to say that you cannot pass a simple
# string as the new_object destination - it must be a Hash that contains a 
# Aws::S3::Client instance. This is so the region is set correctly - it's passed
# in the client instance. Otherwise, you get the error "The bucket you are 
# attempting to access must be addressed using the specified endpoint".

# Tested and working using the Ruby AWS SDK v2.9.5 in January 2018.
client = Aws::S3::Client.new(region: 'eu-west-2')
resource = Aws::S3::Resource.new(client: client)
bucket = resource.bucket(BUCKET_NAME)
errors = []

Model.all.each do |item|
  if item.attachment? # assume using Rails Paperclip model attachments
    current_object = bucket.object(CURRENT_PATH_STRING)
    if current_object.exists?
      new_object = Aws::S3::Object.new(
        BUCKET_NAME, 
        NEW_PATH_STRING,
        {client: client}
      )
      begin
        current_object.move_to(new_object)
      rescue => e
        errors << "Error moving file: - #{e.message}"
      end
    end  
  end
end

p errors