how to configure the Paperclip plugin to handle general file uploading and image thumbnail generation

how to configure Paperclip plugin to handle general file uploading

class Clip < ActiveRecord::Base
  belongs_to :clippable, :polymorphic => true

  has_attached_file :document,
                    :styles => { :thumbnail => "50x50#",
                      :medium => "200x200",
                      :large => "450x450>",
                      :jumbo => "1024x1024>"
                      },
                    :processors => [:general],
                    :url => "/assets/clips/:id/:style/:basename.:extension",
                    :path => ":rails_root/public/assets/clips/:id/:style/:basename.:extension"

  validates_attachment_size :document, :less_than => 5.megabytes

  def parent
    self.clippable_type.constantize.find(self.clippable_id)
  end
end


# RAILS_ROOT/lib/paperclip_processors/general_processor.rb
module Paperclip
  class General < Processor

    def initialize file, options = {}, attachment = nil
      super
      @format              = options[:format]
      @current_format      = File.extname(@file.path)
      @basename            = File.basename(@file.path, @current_format)
    end

    def make
      if @attachment.instance.document_content_type.to_s =~ /image/i
        Thumbnail.make( @file, @options, @attachment )
      else
        Tempfile.new([@basename, @format].compact.join("."))
      end
    end
    
  end # class
end # module