Merge pull request #227338 from erictapen/mastodon

nixos/modules/services/web-apps/mastodon.nix

···
         '';
       }
       {
-        assertion = 1 == builtins.length
-          (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\".";
+        assertion = 1 ==
+          (lib.count (x: x)
+            (lib.mapAttrsToList
+              (_: v: builtins.elem "scheduler" v.jobClasses || v.jobClasses == [ ])
+              cfg.sidekiqProcesses));
+        message = "There must be exactly one Sidekiq queue in services.mastodon.sidekiqProcesses with jobClass \"scheduler\".";
       }
     ];