He estado atrapado en esto por mucho tiempo y no puedo entender qué está mal. Hay muchas personas que parecen tener el mismo problema, pero en realidad no puedo encontrar ninguna respuesta que realmente funcione.

producción.rb

  config.paperclip_defaults = {
  :storage => :s3,
  :s3_credentials => {
    :bucket => ENV['my bucket name is here'],
    :access_key_id => ENV['my key is here'],
    :secret_access_key => ENV['my secret key is here']
  }
}

game.rb

require 'aws/s3'

class Game < ActiveRecord::Base

attr_accessible  :swf, :swf_file_name, :name, :description, :category, :age_group, :dimension_x, :dimension_y, :image, :image_file_name, :feature_image, :feature_image_file_name, :developer, :instructions, :date_to_go_live, :date_to_show_countdown, :plays
has_attached_file :swf

has_attached_file :image

has_attached_file :feature_image

  def swfupload_file=(data)
    data.content_type =
MIME::Types.type_for(data.original_filename).first.content_type
    logger.warn("Data content type is: #{data.content_type}")
    self.file = data
  end

end

paperclip.rb

Paperclip::Attachment.default_options[:url] = ':s3_domain_url'
Paperclip::Attachment.default_options[:path] = '/:class/:attachment/:id_partition/:style/:filename'