owners_by_key

# File activerecord/lib/active_record/associations/preloader/association.rb, line 83
          def owners_by_key
            unless defined?(@owners_by_key)
              @owners_by_key = owners.each_with_object({}) do |owner, h|
                h[convert_key(owner[owner_key_name])] = owner
              end
            end
            @owners_by_key
          end