Paperclip Copy Attachments

copy_attachments.rb

module Paperclip
  module CopyAttachments
    def copy_attachments_from(source_obj, source_bucket = nil, destination_bucket = nil)
      self.class.attachment_definitions.keys.each do |attachment_name|
        source_attachment      = source_obj.send(attachment_name)
        next if source_attachment.blank?

        destination_attachment = self.send(attachment_name)

        connection         = destination_attachment.send(:connection)
        source_bucket      ||= source_attachment.options[:fog_directory]
        destination_bucket ||= destination_attachment.options[:fog_directory]

        [:original, *destination_attachment.styles.keys].uniq.map do |style|
          source_path      = source_attachment.path(style)
          destination_path = destination_attachment.path(style)

          options = {}
          options['x-amz-acl'] = 'public-read' if destination_attachment.fog_public(style)
          Paperclip.log("Copying #{style} from #{source_bucket}/#{source_path} ---> #{destination_bucket}/#{destination_path}")
          begin
            connection.copy_object(source_bucket, source_path, destination_bucket, destination_path, options)
          rescue Excon::Errors::NotFound
            Paperclip.log("Could not find #{style} from #{source_bucket}/#{source_path}")
          end
        end
      end
    end
  end
end

If you are using different :fog only in certain environments, change line 6 to:

        next unless source_attachment.present? && source_attachment.options[:storage] == :fog