Wpdb

require 'active_record'
require 'wpdb'

ActiveRecord::Base.establish_connection(
  :adapter  => 'mysql',
  :host     => 'localhost',
  :port     => 3306,
  :username => 'root',
  :password => '',
  :database => 'your_db_name'
)

wp_post = Wpdb::WpPost.posts.last
puts wp_post.post_title
puts wp_post.wp_comments.count
puts wp_post.wp_categories
puts wp_post.wp_tags