belongs_to :parent, :foreign_key => 'parent_id' class_name: 'Folder'
has_many :folders, :foreign_key => 'parent_id', class_name: 'Folder'
-has_many :comments, :order => "posted_on"
+has_many :comments, -> { order('posted_on DESC') }
has_many :comments, :include => :author
has_many :people, :class_name => "Person"
has_many :people, :conditions => "deleted = 0"
-has_many :tracks, :order => "position"
+has_many :tracks, -> { order(:position) }
has_many :comments, :dependent => :nullify
has_many :comments, :dependent => :destroy
has_many :tags, :as => :taggable