pretalx: backport drf 3.15 support

pkgs/by-name/pr/pretalx/package.nix

@@ -3,6 +3,7 @@
 , gettext
 , python3
 , fetchFromGitHub
+, fetchpatch2
 , plugins ? [ ]
 , nixosTests
 }:
@@ -25,14 +26,6 @@ let
         # fails with some assertions
         doCheck = false;
       });
-
-      djangorestframework = prev.djangorestframework.overridePythonAttrs (oldAttrs: rec {
-        version = "3.14.0";
-        src = oldAttrs.src.override {
-          rev = version;
-          hash = "sha256-Fnj0n3NS3SetOlwSmGkLE979vNJnYE6i6xwVBslpNz4=";
-        };
-      });
     };
   };
 
@@ -78,6 +71,15 @@ python.pkgs.buildPythonApplication rec {
     "static"
   ];
 
+  patches = [
+    (fetchpatch2 {
+      # Backport support for Djangorestframework 3.15.x
+      name = "pretalx-drf-3.15.patch";
+      url = "https://github.com/pretalx/pretalx/commit/43a0416c6968d64ea57720abdb82f482940b11f8.patch";
+      hash = "sha256-Iw1xVF7j7c712kwIk1SMbQSF0ixMUZr1BJib3KAb2HY=";
+    })
+  ];
+
   postPatch = ''
     substituteInPlace src/pretalx/common/management/commands/rebuild.py \
       --replace 'subprocess.check_call(["npm", "run", "build"], cwd=frontend_dir, env=env)' ""
@@ -100,6 +102,7 @@ python.pkgs.buildPythonApplication rec {
     "django-csp"
     "django-filter"
     "django-hierarkey"
+    "djangorestframework"
     "markdown"
     "pillow"
     "python-dateutil"