activerecord/lib/active_record/associations/preloader/has_one.rb


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module ActiveRecord
  module Associations
    class Preloader
      class HasOne < SingularAssociation #:nodoc:

        def association_key_name
          reflection.foreign_key
        end

        def owner_key_name
          reflection.active_record_primary_key
        end

        private

        def build_scope
          super.order(preload_scope.values[:order] || reflection_scope.values[:order])
        end

      end
    end
  end
end