ruby-1.9.2-p0 > a = Assignment.new
 => #<Assignment id: nil, created_at: nil, updated_at: nil> 
ruby-1.9.2-p0 > a.create_video_draft
 => #<Video id: 1, videoable_id: nil, videoable_type: "Assignment", created_at: "2011-02-13 23:00:49", updated_at: "2011-02-13 23:00:49"> 
ruby-1.9.2-p0 > a.create_video_final
 => #<Video id: 2, videoable_id: nil, videoable_type: "Assignment", created_at: "2011-02-13 23:00:56", updated_at: "2011-02-13 23:00:56"> 
ruby-1.9.2-p0 > a.save
 => true 
ruby-1.9.2-p0 >