Fixed #19357 -- Allow non-ASCII chars in filesystem paths

Thanks kujiu for the report and Aymeric Augustin for the review.

2 files changed, 5 insertions, 3 deletions

diff --git a/django/db/models/loading.py b/django/db/models/loading.py
index a0510acc6d..56edc36bec 100644
--- a/django/db/models/loading.py
+++ b/django/db/models/loading.py
@@ -5,6 +5,7 @@ from django.core.exceptions import ImproperlyConfigured
 from django.utils.datastructures import SortedDict
 from django.utils.importlib import import_module
 from django.utils.module_loading import module_has_submodule
+from django.utils._os import upath
 from django.utils import six
 
 import imp
@@ -244,8 +245,8 @@ class AppCache(object):
                 # The same model may be imported via different paths (e.g.
                 # appname.models and project.appname.models). We use the source
                 # filename as a means to detect identity.
-                fname1 = os.path.abspath(sys.modules[model.__module__].__file__)
-                fname2 = os.path.abspath(sys.modules[model_dict[model_name].__module__].__file__)
+                fname1 = os.path.abspath(upath(sys.modules[model.__module__].__file__))
+                fname2 = os.path.abspath(upath(sys.modules[model_dict[model_name].__module__].__file__))
                 # Since the filename extension could be .py the first time and
                 # .pyc or .pyo the second time, ignore the extension when
                 # comparing.
diff --git a/django/db/utils.py b/django/db/utils.py
index a91298626b..842fd354d6 100644
--- a/django/db/utils.py
+++ b/django/db/utils.py
@@ -5,6 +5,7 @@ from threading import local
 from django.conf import settings
 from django.core.exceptions import ImproperlyConfigured
 from django.utils.importlib import import_module
+from django.utils._os import upath
 from django.utils import six
 
 
@@ -27,7 +28,7 @@ def load_backend(backend_name):
     except ImportError as e_user:
         # The database backend wasn't found. Display a helpful error message
         # listing all possible (built-in) database backends.
-        backend_dir = os.path.join(os.path.dirname(__file__), 'backends')
+        backend_dir = os.path.join(os.path.dirname(upath(__file__)), 'backends')
         try:
             builtin_backends = [
                 name for _, name, ispkg in pkgutil.iter_modules([backend_dir])