carriewaveでExifの回転情報をいい感じにする ref: http://qiita.com/ppworks/items/ae479c036d25b3e7b120

file0.txt

class ImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick
  process :fix_rotate

  def fix_rotate
    manipulate! do |img|
      img.auto_orient
      yield(img) if block_given?
      img
    end
  end
end