fix nixos modules

module.nix

@@ -16,7 +16,7 @@ in
       username = mkOption {
         type = lib.types.str;
         description = mdDoc "user to run the service";
-        example = "lenticular_cloud";
+        default = "lenticular_cloud";
       };
       service_domain = mkOption {
         type = lib.types.str;
@@ -52,7 +52,7 @@ in
             };
             SQLALCHEMY_DATABASE_URI = mkOption {
               type = types.str;
-              default = "postgresql://${username}@/${username}?host=/run/postgresql";
+              default = "postgresql://${cfg.username}@/${cfg.username}?host=/run/postgresql";
             }; 
             HYDRA_ADMIN_URL = mkOption {
               type = types.str;
@@ -75,26 +75,26 @@ in
     ];
     
     users = {
-      groups."${username}" = {
+      groups."${cfg.username}" = {
       };
-      users."${username}" = {
+      users."${cfg.username}" = {
         createHome = true;
-        home = "/var/lib/${username}";
+        home = "/var/lib/${cfg.username}";
         description = "web server";
         extraGroups = [
           # "ory-hydra"
         ];
-        group = username;
+        group = cfg.username;
         isSystemUser = true;
       };
     };
 
     services.postgresql = {
       enable = true;
-      ensureDatabases = [ username ];
+      ensureDatabases = [ cfg.username ];
       ensureUsers = [
         {
-          name = username;
+          name = cfg.username;
           ensureDBOwnership = true;
         }
       ];
@@ -116,10 +116,10 @@ in
       serverName = cfg.service_domain;
       locations."/" = {
         recommendedProxySettings = true;
-        proxyPass = "http://unix:/run/${username}/web.sock";
+        proxyPass = "http://unix:/run/${cfg.username}/web.sock";
       };
     };
-    users.users.nginx.extraGroups = [ username ];
+    users.users.nginx.extraGroups = [ cfg.username ];
 
     systemd.services.lenticular-cloud = {
       description = "lenticular account";
@@ -137,7 +137,7 @@ in
         # PYTHONPATH =  "${lenticular-pkg.pythonPath}:${lenticular-pkg}/lib/python3.10/site-packages:${python_path}";
       };
       preStart = ''
-        #cat > ${data_folder}/foobar.conf <<EOF
+        #cat > ${cfg.settings.DATA_FOLDER}/foobar.conf <<EOF
         #SECRET_KEY=""
         #EOF
         ${pkgs.lenticular-cloud}/bin/lenticular_cloud-cli db_upgrade
@@ -145,14 +145,14 @@ in
 
       serviceConfig = {
         Type = "simple";
-        WorkingDirectory = data_folder;
-        User = username;
+        WorkingDirectory = cfg.settings.DATA_FOLDER;
+        User = cfg.username;
         ExecStart = ''${python.pkgs.gunicorn}/bin/gunicorn lenticular_cloud.wsgi --name lenticular_cloud \
               --workers 1 --log-level=info \
-              --bind=unix:/run/${username}/web.sock \
+              --bind=unix:/run/${cfg.username}/web.sock \
               -k gevent'';
         Restart = "on-failure";
-        RuntimeDirectory = username;
+        RuntimeDirectory = cfg.username;
       };
     };