Add Django-5.0 support #143

.github/workflows/test-examples-proj1.yml

@@ -11,7 +11,7 @@ jobs:
       max-parallel: 5
       matrix:
         python-version: ['3.10']
-        django-version: ['3.2', '4.0', '4.2']
+        django-version: ['3.2', '4.0', '4.2', '5.0']
         include:
           - django-version: 'main'
             python-version: '3.10'

.github/workflows/test.yml

@@ -11,12 +11,20 @@ jobs:
       max-parallel: 5
       matrix:
         python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
-        django-version: ['3.2', '4.0', '4.2']
-        include:
-          - django-version: 'main'
+        django-version: ['3.2', '4.0', '4.2', '5.0']
+        exclude:
+          - python-version: '3.11'
+            django-version: '3.2'
+          - python-version: '3.12'
+            django-version: '3.2'
+          - django-version: '5.0'
+            python-version: '3.8'
+          - django-version: '5.0'
             python-version: '3.9'
           - django-version: 'main'
-            python-version: '3.10'
+            python-version: '3.8'
+          - django-version: 'main'
+            python-version: '3.9'
 
     services:
       postgres:

CHANGES.rst

@@ -1,6 +1,13 @@
 CHANGES
 =======
 
+4.2.0 (Unreleased)
+------------------
+
+Features:
+
+* #143 Add Django-5.0 support.
+
 4.1.1 (2024/08/20)
 ------------------
 

django_redshift_backend/_vendor/django40/db/backends/base/base.py

@@ -5,6 +5,7 @@
 import warnings
 from collections import deque
 from contextlib import contextmanager
+from datetime import timezone as pytimezone
 
 try:
     import zoneinfo
@@ -23,6 +24,9 @@
 from django.utils.asyncio import async_unsafe
 from django.utils.functional import cached_property
 
+# django.utils.timezone.utc has been removed in django 5.0 
+timezone.utc = pytimezone.utc
+
 NO_DB_ALIAS = "__no_db__"
 
 

django_redshift_backend/base.py

@@ -16,6 +16,7 @@
 from django.conf import settings
 from django.core.exceptions import FieldDoesNotExist
 from django.db.models import Index
+from django.db.models.expressions import Col
 from django.db.utils import NotSupportedError, ProgrammingError
 
 from ._vendor.django40.db.backends.base.introspection import FieldInfo, TableInfo
@@ -58,6 +59,11 @@ class DatabaseFeatures(BasePGDatabaseFeatures):
     allows_group_by_select_index = True  # since django-4.2
     # since django-4.2. I don't know the Redshift supports comments or not.
     supports_comments = False
+    # django-redshift-backend does not support dj50 features due to dj40 codebase.
+    # https://docs.djangoproject.com/en/5.0/releases/5.0/
+    supports_default_keyword_in_insert = False
+    supports_default_keyword_in_bulk_insert = False
+    supports_nulls_distinct_unique_constraints = False
 
     # If support atomic for ddl, we should implement non-atomic migration for on rename and change type(size)
     # refs django-redshift-backend #96
@@ -146,6 +152,20 @@ def on_conflict_suffix_sql(
         ):
             return ""
 
+    # copy from djang 5.0 postgresql/operations.py
+    def prepare_join_on_clause(self, lhs_table, lhs_field, rhs_table, rhs_field):
+        lhs_expr = Col(lhs_table, lhs_field)
+        rhs_expr = Col(rhs_table, rhs_field)
+
+        # Cast is not impremented for redshift.
+        # Because the following code generate redundant SQL like:
+        # ... LEFT OUTER JOIN "tbl2" ON ("tbl1"."id" = CAST("tbl2"."parent_id" AS integer))
+
+        # if lhs_field.db_type(self.connection) != rhs_field.db_type(self.connection):
+        #     rhs_expr = Cast(rhs_expr, lhs_field)
+
+        return lhs_expr, rhs_expr
+
 
 def _get_type_default(field):
     internal_type = field.get_internal_type()

doc/index.rst

@@ -44,7 +44,7 @@ Support versions
 This product is tested with:
 
 * Python-3.8, 3.9, 3.10, 3.11, 3.12
-* Django-3.2, 4.0, 4.2
+* Django-3.2, 4.0, 4.2, 5.0
 
 License
 =======

pyproject.toml

@@ -23,6 +23,7 @@ classifiers = [
     "Framework :: Django :: 3.2",
     "Framework :: Django :: 4.0",
     "Framework :: Django :: 4.2",
+    "Framework :: Django :: 5.0",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
@@ -35,7 +36,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 dependencies = [
-    "django<5",
+    "django<5.1",
     "backports.zoneinfo;python_version<'3.9'",
 ]
 

tests/test_migrations.py

@@ -289,6 +289,27 @@ def test_add_notnull_with_default(self):
             '''ALTER TABLE "test_pony" ADD COLUMN "name" varchar(10) DEFAULT '' NOT NULL;''',
         ], sqls)
 
+    @pytest.mark.skip('django-redshift-backend does not support in-database defaults')
+    @postgres_fixture()
+    def test_add_db_default(self):
+        from django.db.models.functions import Now
+
+        new_state = self.set_up_test_model('test')
+        operations = [
+            migrations.AddField(
+                model_name='Pony',
+                name='birthday',
+                field=models.DateTimeField(null=False, db_default=Now()),
+            ),
+        ]
+
+        with self.collect_sql() as sqls:
+            self.apply_operations('test', new_state, operations)
+
+        self.assertEqual([
+            '''ALTER TABLE "test_pony" ADD COLUMN "birthday" timestamp with time zone DEFAULT now() NOT NULL;''',
+        ], sqls)
+
     @postgres_fixture()
     def test_add_binary(self):
         from django_redshift_backend.base import DatabaseWrapper, _remove_length_from_type

tox.ini

@@ -1,6 +1,9 @@
 [tox]
 envlist =
-    py{38,39,310,311,312}-dj{32,40,42,main}
+    py{38,39,310}-dj32
+    py{38,39,310,311,312}-dj40
+    py{38,39,310,311,312}-dj42
+    py{310,311,312}-dj50
     lint
     check
 skipsdist = True
@@ -18,6 +21,7 @@ DJANGO =
     3.2: dj32
     4.0: dj40
     4.2: dj42
+    5.0: dj50
     main: djmain
 
 [testenv]
@@ -32,6 +36,7 @@ deps =
     dj32: Django>=3.2,<3.3
     dj40: Django>=4.0,<4.1
     dj42: Django>=4.2,<5.0
+    dj50: Django>=5.0,<5.1
     djmain: https://github.com/django/django/archive/main.tar.gz
 setenv =
     DJANGO_SETTINGS_MODULE = settings