Merge pull request #218 from NuschtOS/preload-exts-24.11

postgres: fix finalPackage not being there on 24.11

Author: SuperSandro2000

modules/postgres.nix

@@ -189,7 +189,13 @@ in
           (lib.mkIf cfg.configurePgStatStatements [ "pg_stat_statements" ])
           # TODO: upstream, this probably requires a new entry in passthru to pick if the object name doesn't match the plugin name or there are multiple
           # https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/services/databases/postgresql.nix#L76
-          (lib.mkIf cfg.preloadAllExtensions (map lib.getName cfg.finalPackage.installedExtensions))
+          (let
+            # drop workaround when dropping support for 24.11
+            # https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/databases/postgresql.nix#L47-L49
+            basePackage = if cfg.enableJIT then cfg.package.withJIT else cfg.package.withoutJIT;
+            postgresPkg = if cfg.extensions == [ ] then basePackage else basePackage.withPackages cfg.extensions;
+            finalPackage = cfg.finalPackage or postgresPkg;
+          in lib.mkIf cfg.preloadAllExtensions (map lib.getName finalPackage.installedExtensions))
         ];
         upgrade.stopServices = with config.services; lib.mkMerge [
           (lib.mkIf (atuin.enable && atuin.database.createLocally) [ "atuin" ])