Rails paperclip plugin

I am a newbie. I am trying to upload an image through paperclip. The url and path code is working but the style option is not working. This is my code:

class User < ActiveRecord::Base
  has_attached_file   :image, :styles => { :small => "150x150>" },
                      :url  => "/assets/users/:id/:style/:basename.:extensio开发者_Go百科n",
                      :path => ":rails_root/public/assets/users/:id/:style/:basename.:extension"
end

When I use the style it doesn't work. If I remove the style option it does work. Please help me out!

Not sure if this will work but try :style_:basename.:extension