feat: django 3.1.7 compatibility (#2)

README.rst

@@ -1,12 +1,10 @@
-Looking for sponsor for working on django 1.11 to 2.2 support https://github.com/celery/django-celery/issues/568
-
 ===============================================
  django-celery - Celery Integration for Django
 ===============================================
 
 .. image:: https://user-images.githubusercontent.com/26336/59113881-917c5180-890b-11e9-9863-f5a98d0e235e.png
 
-:Version: 3.3.1
+:Version: 4.1.0sc
 :Web: http://celeryproject.org/
 :Download: http://pypi.python.org/pypi/django-celery/
 :Source: http://github.com/celery/django-celery/

djcelery/__init__.py

@@ -6,7 +6,7 @@
 import os
 import sys
 
-VERSION = (4, 0, 0, 'sc')
+VERSION = (4, 1, 0, 'sc')
 __version__ = '.'.join(map(str, VERSION[0:3])) + ''.join(VERSION[3:])
 __author__ = 'Ask Solem'
 __contact__ = '[email protected]'

djcelery/db.py

@@ -49,12 +49,8 @@ def commit_on_success(*args, **kwargs):
     @contextmanager
     def commit_on_success(using=None):  # noqa
         connection = transaction.get_connection(using)
-        if connection.features.autocommits_when_autocommit_is_off:
-            # ignore stupid warnings and errors
+        with transaction.atomic(using):
             yield
-        else:
-            with transaction.atomic(using):
-                yield
 
     def commit_unless_managed(*args, **kwargs):  # noqa
         pass

djcelery/picklefield.py

@@ -96,7 +96,7 @@ def to_python(self, value):
                     raise
                 return value
 
-    def from_db_value(self, value, expression, connection, context):
+    def from_db_value(self, value, expression, connection, context = None):
         return self.to_python(value)
 
     def get_db_prep_value(self, value, **kwargs):