class Sponsor < ActiveRecord::Base belongs_to :sponsor_club, :class_name => "Club", :foreign_key => "club_id" belongs_to :sponsorable, :polymorphic => true belongs_to :thing, :polymorphic => true, :foreign_type => :sponsorable_type, :foreign_key => :sponsorable_id belongs_to :sponsorable_with_conditions, -> { where :name => "Ernie"}, :polymorphic => true, :foreign_type => "sponsorable_type", :foreign_key => "sponsorable_id" end