activerecord/lib/active_record/associations/has_one_through_association.rb


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module ActiveRecord
  module Associations
    class HasOneThroughAssociation < HasManyThroughAssociation

      def create_through_record(new_value) #nodoc:
        klass = @reflection.through_reflection.klass

        current_object = @owner.send(@reflection.through_reflection.name)

        if current_object
          new_value ? current_object.update_attributes(construct_join_attributes(new_value)) : current_object.destroy
        else
          @owner.send(@reflection.through_reflection.name,  klass.send(:create, construct_join_attributes(new_value))) if new_value
        end
      end

    private
      def find(*args)
        super(args.merge(:limit => 1))
      end

      def find_target
        super.first
      end

      def reset_target!
        @target = nil
      end
    end
  end
end