fix: Folder permission cache update sometimes raised TypeError

Author: fsbraun

filer/cache.py

@@ -86,6 +86,4 @@ def update_folder_permission_cache(user: UserModel, permission: str, id_list: ty
     permission (str): The permission to update.
     id_list (list): The list of IDs to set as the new permissions.
     """
-    perms = get_folder_permission_cache(user, permission) or {}
-    perms[user.pk] = id_list
-    cache.set(get_folder_perm_cache_key(user, permission), perms)
+    cache.set(get_folder_perm_cache_key(user, permission), {user.pk: set(id_list)})

tests/test_permission_cache.py

@@ -45,3 +45,9 @@ def test_update_folder_permission_cache_updates_permissions_for_user_and_permiss
         update_folder_permission_cache(self.user, self.permission, self.id_list)
         permissions = get_folder_permission_cache(self.user, self.permission)
         self.assertEqual(permissions, self.id_list)
+
+    def test_update_folder_permission_cache_overwrites_existing_cache_value(self):
+        update_folder_permission_cache(self.user, self.permission, {2})
+        update_folder_permission_cache(self.user, self.permission, self.id_list)
+        permissions = get_folder_permission_cache(self.user, self.permission)
+        self.assertEqual(permissions, self.id_list)