Basic setting playlist

app/models/beathaven/playlist.rb

@@ -1,4 +1,5 @@
 class Playlist < ActiveRecord::Base
   belongs_to :user
+  belongs_to :artist
   has_many :playlist_items
 end

app/models/music/artist.rb

@@ -3,6 +3,7 @@ class Artist < ActiveRecord::Base
   has_many :artist_links, :dependent => :destroy
   has_many :artist_aliases, :dependent => :destroy
   has_many :tracks, :through => :track_artists
+  has_many :playlists
   
   after_initialize :prepare_description
   

app/models/music/track.rb

@@ -2,7 +2,7 @@ class Track < ActiveRecord::Base
   belongs_to :album
   has_many :track_artists
   has_many :artists, :through => :track_artists
-  @duration
+  has_many :playlist_items
   
   def duration
     if self.length