gallery.rb

class Gallery < ActiveRecord::Base
 has_many :gallery_photos
 accepts_nested_attributes_for :gallery_photos

end

gallery_photo.rb

class GalleryPhoto < ActiveRecord::Base
 belongs_to :gallery
  
  has_attached_file :photo, 



    
    :styles => { :small => ["150", :png], :large => ["500", :png], :very_large => ['750x500>', :png] },

    
    :path => ":rails_root/public/images/:class/:attachment/:id/:style_:basename.png",

    
    :url => "/images/:class/:attachment/:id/:style_:basename.png",

    
    :default_url => "/images/sem_imagem.gif"


  def geometry

    geo = Paperclip::Geometry.from_file(photo.to_file(:large))

    ratio = geo.width/geo.height

    if ratio > 1

      return 'horizontal'

    else

     return 'vertical'

    end

  end

  def width
    geo = Paperclip::Geometry.from_file(photo.to_file(:large))

    return geo.width
    
  end

  def height

    geo = Paperclip::Geometry.from_file(photo.to_file(:large))

    return geo.height
    
  end
end