error for attaching files to statuses

Hey guys,

i havnt really had any trouble until now, but I could use some help. I'm in the advanced RoR tutorials, trying to add files to the status updates. I've gone through the videos twice and still havnt caught my error.

when I try to attach a file I'm given this error...

Paperclip::Error in StatusesController#create Document model missing required attr_accessor for 'attachment_file_name'

my create documents migration looks like this...

class CreateDocuments < ActiveRecord::Migration
 def change
   create_table :documents do |t|
      t.integer :user_id
      t.timestamps
 end

  add_index :documents, :user_id
  add_attachment :documents, :attachment
  add_column :statuses, :document_id, :integer

  end
end

for documents.rb I have this

class Document < ActiveRecord::Base

  attr_accessible :attachment
  has_attached_file :attachment
end

and added the @status.build_document to my new method in status controller

this is the repository for any other information https://github.com/mitchcail/Chipper

Jason Seifer, have you come across this problem at all? or know how to fix it?

thanks, mitch