From 5202dc074857ed2bfdcabbdcf5f0ac896f636b8c Mon Sep 17 00:00:00 2001
From: Trenton H <797416+stumpylog@users.noreply.github.com>
Date: Fri, 8 May 2026 13:48:47 -0700
Subject: [PATCH] Fix: Clear ContentType/guardian caches at import and test
 cases (#12758)

---
 .../management/commands/document_importer.py      |  7 +++++++
 src/documents/tests/conftest.py                   | 15 +++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/documents/management/commands/document_importer.py b/src/documents/management/commands/document_importer.py
index 6cb495777..90986858b 100644
--- a/src/documents/management/commands/document_importer.py
+++ b/src/documents/management/commands/document_importer.py
@@ -30,6 +30,7 @@ from django.db.models import Model
 from django.db.models.signals import m2m_changed
 from django.db.models.signals import post_save
 from filelock import FileLock
+from guardian.shortcuts import clear_ct_cache
 
 from documents.file_handling import create_source_path_directory
 from documents.management.commands.base import PaperlessCommand
@@ -429,6 +430,12 @@ class Command(CryptMixin, PaperlessCommand):
             self.stdout.write(self.style.ERROR(self._import_error_context_message()))
             raise
 
+        # ContentType/Permission rows were deleted and reinserted above; stale
+        # in-process caches must be invalidated so permission checks use the
+        # new IDs rather than pre-import PKs.
+        ContentType.objects.clear_cache()
+        clear_ct_cache()
+
     def handle(self, *args, **options) -> None:
         logging.getLogger().handlers[0].level = logging.ERROR
 
diff --git a/src/documents/tests/conftest.py b/src/documents/tests/conftest.py
index 88f0e9d76..07c20c944 100644
--- a/src/documents/tests/conftest.py
+++ b/src/documents/tests/conftest.py
@@ -8,6 +8,8 @@ from typing import TYPE_CHECKING
 import filelock
 import pytest
 from django.contrib.auth import get_user_model
+from django.contrib.contenttypes.models import ContentType
+from guardian.shortcuts import clear_ct_cache
 from pytest_django.fixtures import SettingsWrapper
 from rest_framework.test import APIClient
 
@@ -158,6 +160,19 @@ def user_client(rest_api_client: APIClient, regular_user: UserModelT) -> APIClie
     return rest_api_client
 
 
+@pytest.fixture(autouse=True)
+def _clear_content_type_caches() -> None:
+    """Clear Django's ContentType cache and guardian's lru_cache before each test.
+
+    Tests that delete and reinsert ContentType/Permission rows (e.g. the
+    importer) corrupt both caches. Without this fixture a subsequent test on
+    the same xdist worker sees stale ContentType objects and guardian raises
+    MixedContentTypeError.
+    """
+    ContentType.objects.clear_cache()
+    clear_ct_cache()
+
+
 @pytest.fixture(scope="session", autouse=True)
 def faker_session_locale():
     """Set Faker locale for reproducibility."""