Migrate communityengine photos from attachment_fu to paperclip

convert_images_to_paperclip.rb

class ConvertImagesToPaperclip

  def self.convert_all

    # Update table information
    Photo.reset_column_information

    # Delete all attachement_fu image sizes
    Photo.delete_all("parent_id IS NOT NULL")

    # Migrate data
    Photo.all.each do |photo|
      populate_paperclip_from_attachment_fu(photo, photo, 'photo', 'photos') if photo
      photo.photo.reprocess! if photo.photo
    end

  end


  def self.populate_paperclip_from_attachment_fu(model, attachment, prefix, path_prefix)
    unless attachment.photo_file_name.nil?
      # The columns have already been renamed by migration
      #model.send("#{prefix}_file_name=", attachment.photo_filename)
      #model.send("#{prefix}_content_type=", attachment.content_type)
      #model.send("#{prefix}_file_size=", attachment.size)
      puts "# data_file_name: #{model.send("#{prefix}_file_name")}"
      puts "# data_content_type: #{model.send("#{prefix}_content_type")}"
      puts "# data_file_size: #{model.send("#{prefix}_file_size")}"

      # Get file path from attachment_fu
      file_path = ("%08d" % model.id).scan(/..../).join('/')
      old_path = File.join(Rails.root, 'public', path_prefix, file_path, attachment.photo_file_name)
      # Need to use URI::decode to handle files with åäö in
      new_path = model.send(prefix).path(:original)
      new_folder = File.dirname(new_path)

      if File.exists?(old_path)
        unless File.exists?(new_folder)
          FileUtils.mkdir_p(new_folder)
        end

        puts "Copying #{old_path} to #{new_path}"
        system("cp #{old_path} #{new_path}")
        model.save
      else
        puts "No such file: #{old_path}"
      end
    end
  end

end