owners_by_key

# File activerecord/lib/active_record/associations/preloader/association.rb, line 59
        def owners_by_key
          @owners_by_key ||= if key_conversion_required?
                               owners.group_by do |owner|
                                 owner[owner_key_name].to_s
                               end
                             else
                               owners.group_by do |owner|
                                 owner[owner_key_name]
                               end
                             end
        end