gistfile1.rb

has_many :user_favorite_markets
  :class_name => "UserFavoriteMarket",
  :foreign_key => :user_id
has_many :favorite_markets, 
  :class_name => "FarmersMarket", 
  :through => :user_favorite_markets
  :source => :market

# I think this is the general idea. You have to have an association for the join table as well.


has_many :favorite_markets,
   :through => :user_favorite_markets
   :select => 'markets.name, user_favorite_markets.*',
   :source => :market