Add Django 4 compatibility

.github/workflows/django.yml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.7, 3.8, 3.9]
-        django_version: [~=2.2.0, ~=3.2.0]
+        python-version: [3.8, 3.9, '3.10', 3.11]
+        django_version: [~=3.2.0, ~=4.2.0]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}

.travis.yml

@@ -3,34 +3,16 @@ os: linux
 language: python
 jobs:
   include:
-    - python: "2.7"
-      env: DJANGO=1.11.* DJANGO_SETTINGS_MODULE='settings_sqllite'
-    - python: "2.7"
-      env: DJANGO=1.11.* DJANGO_SETTINGS_MODULE='settings_postgres'
+    - python: "3.8"
+      env: DJANGO=3.2.* DJANGO_SETTINGS_MODULE='settings_sqllite'
+    - python: "3.8"
+      env: DJANGO=3.2.* DJANGO_SETTINGS_MODULE='settings_postgres'
       services:
         - postgresql
       before_script:
         - psql -c 'create database travis_test;' -U postgres
-    - python: "2.7"
-      env: DJANGO=1.11.* DJANGO_SETTINGS_MODULE='settings_mysql'
-      services:
-        - mysql
-      before_script:
-        - mysql -e 'create database travis_test;'
-    - python: "3.7"
-      env: DJANGO=1.11.* DJANGO_SETTINGS_MODULE='settings_sqllite'
-    - python: "3.7"
-      env: DJANGO=2.0.* DJANGO_SETTINGS_MODULE='settings_sqllite'
-    - python: "3.7"
-      env: DJANGO=3.0.* DJANGO_SETTINGS_MODULE='settings_sqllite'
-    - python: "3.7"
-      env: DJANGO=3.0.* DJANGO_SETTINGS_MODULE='settings_postgres'
-      services:
-        - postgresql
-      before_script:
-        - psql -c 'create database travis_test;' -U postgres
-    - python: "3.7"
-      env: DJANGO=3.0.* DJANGO_SETTINGS_MODULE='settings_mysql'
+    - python: "3.8"
+      env: DJANGO=3.2.* DJANGO_SETTINGS_MODULE='settings_mysql'
       services:
         - mysql
       before_script:

django_cron/backends/lock/database.py

@@ -5,13 +5,13 @@
 
 class DatabaseLock(DjangoCronJobLock):
     """
-    Locking cron jobs with database. Its good when you have not parallel run and want to make sure 2 jobs won't be
+    Locking cron jobs with database. It's good when you have not parallel run and want to make sure 2 jobs won't be
     fired at the same time - which may happened when job execution is longer that job interval.
     """
 
     @transaction.atomic
     def lock(self):
-        lock, created = CronJobLock.objects.get_or_create(job_name=self.job_name)
+        lock, created = CronJobLock.objects.select_for_update().get_or_create(job_name=self.job_name)
         if lock.locked:
             return False
         else:

django_cron/cron.py

@@ -1,6 +1,6 @@
 from django.conf import settings
 
-from django_common.helper import send_mail
+from django.core.mail import send_mail
 
 from django_cron import CronJobBase, Schedule, get_class
 from django_cron.models import CronJobLog
@@ -97,5 +97,5 @@ def get_send_mail_kwargs(self, cron_cls, failed_jobs):
         return dict(
             subject=subject, message=message,
             from_email=self.config['CRON_FAILURE_FROM_EMAIL'],
-            recipient_emails=self.config['CRON_FAILURE_EMAIL_RECIPIENTS']
+            recipient_list=self.config['CRON_FAILURE_EMAIL_RECIPIENTS']
         )

django_cron/tests.py

@@ -480,5 +480,5 @@ def test_uses_send_mail(self, mock_send_mail):
         self.assertIn('ERROR!!!', kwargs['subject'])
         self.assertEquals('[email protected]', kwargs['from_email'])
         self.assertEquals(
-            ['[email protected]', '[email protected]'], kwargs['recipient_emails']
+            ['[email protected]', '[email protected]'], kwargs['recipient_list']
         )

setup.py

@@ -29,7 +29,7 @@
     long_description=long_description,
     keywords='django cron',
     zip_safe=False,
-    install_requires=['Django>=2.2,<4', 'django-common-helpers>=0.6.4'],
+    install_requires=['Django>=3.2,<5', 'django-common-helpers>=0.6.4'],
     test_suite='runtests.runtests',
     include_package_data=True,
     classifiers=[