gistfile1.rb

class TempImage < Image
  has_attachment({
    :storage => :file_system,
    :path_prefix => "public/uploads/#{table_name}",
    }.merge(COMMON_ATTACHMENT_OPTIONS)
  )

  after_create :queue_move_to_s3

  def move_to_s3
    local_image = self
    pseudo_s3_image = Image.find(id)

    AWS::S3::Base.establish_connection!(
      :access_key_id     => pseudo_s3_image.s3_config[:access_key_id],
      :secret_access_key => pseudo_s3_image.s3_config[:secret_access_key]
    )
    logger.debug "TempImage ##{id}: Connected to S3"

    logger.debug "TempImage ##{id}: Sending file..."
    response = AWS::S3::S3Object.store(
      pseudo_s3_image.full_filename,
      File.open(local_image.full_filename),
      pseudo_s3_image.bucket_name,
      :content_type => local_image.content_type,
      :access => pseudo_s3_image.attachment_options[:s3_access]
    )
    raise "Unable to store #{local_image.full_filename} in S3" unless response.success?
    logger.debug "TempImage ##{id}: File sent!"

    logger.debug "TempImage ##{id}: Toggling temporary status..."
    pseudo_s3_image.toggle!(:temporary)

    logger.debug "TempImage ##{id}: Erasing local file..."
    FileUtils.rm local_image.full_filename

    logger.debug "TempImage ##{id}: Erasing empty dirs..."
    Utilities.delete_empty_directories("#{Rails.root}/#{local_image.attachment_options[:path_prefix]}")

    logger.debug "TempImage ##{id}: Done!"
    true
  end

  def destroy
    raise "should call destroy on the permanent image instead"
  end

  protected

    # after_create: calls move_to_s3 asynchronously (via delayed_job)
    def queue_move_to_s3
      # método send_later fornecido pelo DelayedJob
      send_later(:move_to_s3)
    end

end