nixos/mastodon: fixup sidekiq jobClasses assertion

        '';

      }

      {

        assertion = 1 == builtins.length

        assertion = 1 ==

          (lib.count (x: x)

            (lib.mapAttrsToList

              (_: v: builtins.elem "scheduler" v.jobClasses || v.jobClasses == [ ])

            cfg.sidekiqProcesses);

        message = "There must be one and only one Sidekiq queue in services.mastodon.sidekiqProcesses with jobClass \"scheduler\".";

              cfg.sidekiqProcesses));

        message = "There must be exactly one Sidekiq queue in services.mastodon.sidekiqProcesses with jobClass \"scheduler\".";

      }

    ];