user.artist.rb

2.0.0-p353 :060 >   u = User.where("user_type = 2").first; puts u.id; nil
  User Load (0.8ms)  SELECT `users`.* FROM `users` WHERE (user_type = 2) ORDER BY users.created_at DESC LIMIT 1
673
 => nil 
2.0.0-p353 :061 > test_artist = u.artists.first; puts test_artist.id; nil
  Artist Load (0.6ms)  SELECT `artists`.* FROM `artists` WHERE `artists`.`user_id` = 673 ORDER BY artists.created_at DESC LIMIT 1
162
 => nil 
2.0.0-p353 :062 > test_user = test_artist.user; puts test_user.id; nil
  User Load (0.5ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 673 ORDER BY users.created_at DESC LIMIT 1
673
 => nil 
2.0.0-p353 :063