python3Packages.django-admin-sortable2: add missing JS file (#401356)

pkgs/development/python-modules/django-admin-sortable2/default.nix

@@ -1,18 +1,15 @@
 {
   lib,
+  buildNpmPackage,
   buildPythonPackage,
   pythonOlder,
   fetchFromGitHub,
   setuptools,
   django,
 }:
-
-buildPythonPackage rec {
+let
   pname = "django-admin-sortable2";
   version = "2.2.6";
-  pyproject = true;
-
-  disabled = pythonOlder "3.9";
 
   src = fetchFromGitHub {
     owner = "jrief";
@@ -21,10 +18,35 @@ buildPythonPackage rec {
     hash = "sha256-MIxZ33Q8dHo102zvQqMiOlxtPjkenQQYTRyXJOHdCqE=";
   };
 
+  assets = buildNpmPackage {
+    pname = "${pname}-assets";
+    inherit version src;
+    npmDepsHash = "sha256-zM2iSCrGX5sS7Ysmmo8nR+/V9pMOatN6DX/G+hGdFEU=";
+
+    installPhase = ''
+      runHook preInstall
+
+      install -Dm644 adminsortable2/static/adminsortable2/js/*.js -t $out
+
+      runHook postInstall
+    '';
+  };
+in
+
+buildPythonPackage rec {
+  inherit pname version src;
+  pyproject = true;
+
+  disabled = pythonOlder "3.9";
+
   build-system = [ setuptools ];
 
   dependencies = [ django ];
 
+  preBuild = ''
+    install -Dm644 ${assets}/*.js -t adminsortable2/static/adminsortable2/js
+  '';
+
   pythonImportsCheck = [ "adminsortable2" ];
 
   # Tests are very slow (end-to-end with playwright)