Method to determine the orientation of an image using Paperclip

paperclip_orientation.rb

# via http://jimneath.org/2010/06/10/calculating-an-images-orientation-using-paperclip/

class Image < ActiveRecord::Base
  # Paperclip
  has_attached_file :file

  # Callbacks
  before_create :set_orientation

  protected

  def set_orientation
    original_file = self.file.to_file(:original)
    dimensions = Paperclip::Geometry.from_file(original_file)
    self.orientation = (dimensions.width > dimensions.height) ? 'landscape' : 'portrait'
  end
end