gistfile1.rbx

  def create
    @photo = Photo.new :image => params[:Filedata]
    @photo.save
    render :partial => '/photos/show', :locals => { :photo => @photo }       
  end

class Photo < ActiveRecord::Base
 
  has_attached_file :image, 
    :styles => { :medium => "500", :small => "150x150#" },
    :path => ":rails_root/public/assets/images/:id/:style.:extension",
    :url => "/assets/images/:id/:style.:extension"     
  
end