multiple-associations-in-same-table.rb

class Combatant < ActiveRecord::Base
  belongs_to :dojo
  has_many :winning_fights, :class_name => "Fight", :foreign_key => "winning_combatant_id"
  has_many :losing_fights, :class_name => "Fight", :foreign_key => "losing_combatant_id"
end

class Dojo < ActiveRecord::Base
  has_many :combatants
  has_many :winning_fights, :class_name => "Fight", :foreign_key => "winning_dojo_id"
  has_many :losing_fights, :class_name => "Fight", :foreign_key => "losing_dojo_id"
end

class Fight < ActiveRecord::Base
  belongs_to :winning_dojo, :class_name => "Dojo"
  belongs_to :losing_dojo, :class_name => "Dojo"

  belongs_to :winning_combatant, :class_name => "Combatant"
  belongs_to :losing_combatant, :class_name => "Combatant"
end