added artists, comments

app/logical/favorite.rb

@@ -0,0 +1,21 @@
+class Favorite
+  def self.table_name_for(user)
+    "favorites_#{user.id % 10}"
+  end
+  
+  def self.create(user, post)
+    ActiveRecord::Base.connection.execute("INSERT INTO #{table_name_for(user)} (user_id, post_id) VALUES (#{user.id}, #{post.id})")
+  end
+  
+  def self.destroy(user, post)
+    ActiveRecord::Base.connection.execute("DELETE FROM #{table_name_for(user)} WHERE user_id = #{user.id} AND post_id = #{post.id}")
+  end
+  
+  def self.destroy_all_for_post(post)
+    ActiveRecord::Base.connection.execute("DELETE FROM #{table_name_for(user)} WHERE post_id = #{post.id}")
+  end
+  
+  def self.destroy_all_for_user(user)
+    ActiveRecord::Base.connection.execute("DELETE FROM #{table_name_for(user)} WHERE user_id = #{user.id}")
+  end
+end