amazonS3 + fog + carrierwave, fileupload setting.

carrierwave.rb

CarrierWave.configure do |config|
  config.fog_credentials = 
    :provider               => 'AWS',
    :aws_access_key_id      => ENV["AWS_S3_KEY_ID"],
    :aws_secret_access_key  => ENV["AWS_S3_SECRET_KEY"]
  }
  config.fog_directory  = ENV["AWS_S3_BUCKET"]
end

image_uploader.rb

# encoding: utf-8

class ImageUploader < CarrierWave::Uploader::Base

  include CarrierWave::RMagick
  
  storage Rails.env.production? ? :fog : :file

  def cache_dir
  "#{Rails.root}/tmp/uploads"
  end

  version :thumb do
    process :resize_to_limit => [200, 200]
  end
  version :icon do
    process :resize_to_fill => [64,64]
  end
  version :small_icon do
    process :resize_to_fill => [32,32]
  end
 
end