ActiveRecord with habtm and owner

gistfile1.rb

class Playlist < ActiveRecord::Base
  has_and_belongs_to_many :users
  belongs_to :owner, class_name: "User", inverse_of: :owned_playlist
  
  def editable_by?(user)
    self.owner == user
  end
end

class User < ActiveRecord::Base
  has_and_belongs_to_many :playlists
  has_many :owned_playlists, inverse_of: :owner
end

# Add an owner_id to your playlists table and everything should be dandy

# you will need an playlists_users table that consists of just user_id and playlist_id for the habtm relationship