Clear ContentType cache between tests

docs/changelog.rst

@@ -9,6 +9,12 @@ Compatibility
 
 * Official Django 6.1 support.
 
+Bugfixes
+^^^^^^^^
+
+* Clear Django's ContentType cache between tests so query counts do not depend
+  on test ordering (`#1156 <https://github.com/pytest-dev/pytest-django/issues/1156>`__).
+
 v4.14.0 (2026-08-10)
 --------------------
 

docs/helpers.rst

@@ -619,6 +619,14 @@ be cleared for each test to avoid hitting the cache and causing the wrong Site
 object to be returned by ``Site.objects.get_current()``.
 
 
+Clearing of ContentType cache
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If ``django.contrib.contenttypes`` is in your INSTALLED_APPS, the ContentType
+cache will be cleared for each test to avoid test ordering affecting query
+counts.
+
+
 Clearing of mail.outbox
 ~~~~~~~~~~~~~~~~~~~~~~~
 

pytest_django/plugin.py

@@ -854,6 +854,21 @@ def _django_clear_site_cache() -> None:
             Site.objects.clear_cache()
 
 
+@pytest.fixture(autouse=True)
+def _django_clear_contenttypes_cache() -> None:
+    """Clears ``ContentType`` cache to avoid unexpected behavior with cached
+    content types.
+    """
+
+    if django_settings_is_configured():
+        from django.conf import settings as dj_settings
+
+        if "django.contrib.contenttypes" in dj_settings.INSTALLED_APPS:
+            from django.contrib.contenttypes.models import ContentType
+
+            ContentType.objects.clear_cache()
+
+
 # ############### Helper Functions ################
 
 

tests/test_environment.py

@@ -2,6 +2,7 @@
 import sys
 
 import pytest
+from django.contrib.contenttypes.models import ContentType
 from django.contrib.sites import models as site_models
 from django.contrib.sites.models import Site
 from django.core import mail
@@ -381,6 +382,14 @@ def test_clear_site_cache_check_site_cache_size(site_name: str, settings) -> Non
     assert len(site_models.SITE_CACHE) == 1
 
 
+@pytest.mark.django_db
+@pytest.mark.parametrize("model", [Item, Site])
+def test_clear_contenttypes_cache(model: type[Item] | type[Site]) -> None:
+    assert ContentType.objects._cache == {}
+    ContentType.objects.get_for_model(model)
+    assert ContentType.objects._cache
+
+
 @pytest.mark.django_project(
     project_root="django_project_root",
     create_manage_py=True,