gistfile1.rb

add_column :attachments, :file, :string

class Attachment < ActiveRecord::Base
  mount_uploader :file, AttachmentUploader
end

attachment = Attachment.first
 => #<Attachment id: 2, created_at: "2011-05-13 22:13:22", updated_at: "2011-05-13 22:13:22", owner_type: "Suit", owner_id: 8, file: "secretsofthejavascriptninja.pdf", original_filename: "SecretsoftheJavaScriptNinja.pdf", content_type: "application/pdf"> 
 
> attachment.file
 => /uploads/attachment/file/2/secretsofthejavascriptninja.pdf 
 
> attachment.file.class
 => AttachmentUploader
 
> attachment.file.filename
 => nil
 
> attachment.file.file
 => #<CarrierWave::SanitizedFile:0x00000106a7b6b8 @file="/Users/brandon/Sites/highgroove/discovery-port/public/uploads/attachment/file/2/secretsofthejavascriptninja.pdf", @original_filename=nil, @content_type=nil>

> attachment.file.file.class
 => CarrierWave::SanitizedFile

> attachment.file.file.filename
 => "secretsofthejavascriptninja.pdf"