Re:help for act as commentable

Hi,

I am facing problem during act as commentable plugin.

i had follwed these two links

http://juixe.com/techknow/index.php/2006/06/18/acts-as-commentable-plugin/

http://juixe.com/techknow/index.php/2006/07/09/comments-on-acts-as-commentable/

error undefined method order in comment_methods.rb.

shall create commentable model?