STI about paper_trail HOT 7 CLOSED

ruby-1.9.2-p180 :011 > post = NewsPost.new(:name => '1', :text => '1', :rubric_id => 100)
 => #<NewsPost id: nil, rubric_id: 100, name: "1", thread_id: nil, genre: nil, region_id: nil, published_at: nil, annotation: nil, text: "1", album_id: nil, video_id: nil, source: nil, source_url: nil, author_name: nil, author_email: nil, exclude_from_rss: nil, main_in_rubric_from: nil, main_on_site_from: nil, authorship: nil, commentable: false, weight: 5, links: nil, old_id: nil, views_count: 0, created_at: nil, updated_at: nil, creator_id: nil, updater_id: nil, storyline_id: nil, locked_by: nil, visibility: nil, post_image_file_name: nil, post_image_content_type: nil, post_image_file_size: nil, post_image_updated_at: nil, type: "NewsPost", image_title: nil, author_id: nil, image_description: nil, image_author: nil> 
ruby-1.9.2-p180 :012 > post.save
 => true 
ruby-1.9.2-p180 :013 > Version.last
 => #<Version id: 40, item_type: "Post", item_id: 230755, event: "create", whodunnit: nil, object: nil, created_at: "2011-07-07 11:39:02"> 
ruby-1.9.2-p180 :014 > post.destroy
 => #<NewsPost id: 230755, rubric_id: 100, name: "1", thread_id: nil, genre: nil, region_id: nil, published_at: nil, annotation: nil, text: "1", album_id: nil, video_id: nil, source: nil, source_url: nil, author_name: nil, author_email: nil, exclude_from_rss: nil, main_in_rubric_from: nil, main_on_site_from: nil, authorship: nil, commentable: false, weight: 5, links: nil, old_id: nil, views_count: 0, created_at: "2011-07-07 11:39:02", updated_at: "2011-07-07 11:39:02", creator_id: nil, updater_id: nil, storyline_id: nil, locked_by: nil, visibility: nil, post_image_file_name: nil, post_image_content_type: nil, post_image_file_size: nil, post_image_updated_at: nil, type: "NewsPost", image_title: nil, author_id: nil, image_description: nil, image_author: nil> 
ruby-1.9.2-p180 :015 > Version.last
 => #<Version id: 41, item_type: "NewsPost", item_id: 230755, event: "destroy", whodunnit: nil, object: "---\nalbum_id: !!null \nannotation: !!null \nauthor_em...", created_at: "2011-07-07 11:39:47">