Work around psycopg2.9 + django 3.0 compatibility issue

Author: Photonios

settings.py

@@ -11,7 +11,7 @@
     'default': dj_database_url.config(default='postgres:///psqlextra'),
 }
 
-DATABASES['default']['ENGINE'] = 'psqlextra.backend'
+DATABASES['default']['ENGINE'] = 'tests.psqlextra_test_backend'
 
 LANGUAGE_CODE = 'en'
 LANGUAGES = (

tests/psqlextra_test_backend/__init__.py

@@ -0,0 +1,23 @@
+from datetime import timezone
+
+import django
+
+from django.conf import settings
+
+from psqlextra.backend.base import DatabaseWrapper as PSQLExtraDatabaseWrapper
+
+
+class DatabaseWrapper(PSQLExtraDatabaseWrapper):
+    # Works around the compatibility issue of Django <3.0 and psycopg2.9
+    # in combination with USE_TZ
+    #
+    # See: https://github.com/psycopg/psycopg2/issues/1293#issuecomment-862835147
+    if django.VERSION < (3, 1):
+
+        def create_cursor(self, name=None):
+            cursor = super().create_cursor(name)
+            cursor.tzinfo_factory = (
+                lambda offset: timezone.utc if settings.USE_TZ else None
+            )
+
+            return cursor