小商城的代码Post-install message from paperclip: ################################################## # NOTE FOR UPGRADING FROM PRE-3.0 VERSION # ##################################################

Paperclip 3.0 introduces a non-backward compatible change in your attachment path. This will help to prevent attachment name clashes when you have multiple attachments with the same name. If you didn’t alter your attachment’s path and are using Paperclip’s default, you’ll have to add ‘:path` and `:url` to your `has_attached_file` definition. For example:

has_attached_file :avatar,
  :path => ":rails_root/public/system/:attachment/:id/:style/:filename",
  :url => "/system/:attachment/:id/:style/:filename"