Carrierwave auto orient image explained

gistfile1.txt

module CarrierWave
  module MiniMagick
    # Rotates the image based on the EXIF Orientation
    # According to http://jpegclub.org/exif_orientation.html
    def auto_orient
      manipulate! do |image|
        case image['EXIF:Orientation'].to_i
        when 2
          image.flop
        when 3
          image.rotate(180)
        when 4
          image.flip
        when 5
          image.transpose
        when 6
          image.rotate(90)
        when 7
          image.transverse
        when 8
          image.rotate(270)
        end

        image
      end
    end
  end
end

This is the same as

module CarrierWave
  module MiniMagick
    # Rotates the image based on the EXIF Orientation
    def auto_orient
      manipulate! do |image|
        image.tap(&:auto_orient)
      end
    end
  end
end