(Django 5.0.1) AttributeError at /admin/django_celery_beat/crontabschedule/add/

[AlexEnrique]

Summary:

There are two places where AttributeError is raised:

• Running celery beat with celery -A project beat -l INFO --scheduler django_celery_beat.schedulers:DatabaseScheduler

• Clicking in "+ Add" button for Crontabs in the Django admin raised AttributeError (traceback at the end).

Versions used

• Python 3.12.1
• celery==5.3.6
• Django==5.0.1
• django-celery-beat==2.1.0
• django-timezone-field==4.2.3
• Running on Docker, with image = python:3.12.1-alpine3.19

Exact steps to reproduce the issue:

1. Install the above dependencies
2. Run the migrate command
3. Go to the django Admin > Periodic Tasks > Crontabs
4. Click in the "+Add" or "+ADD CRONTAB" button

Detailed information

#699
https://docs.djangoproject.com/en/dev/releases/5.0/
https://docs.djangoproject.com/en/dev/releases/5.0.1/

Tracebacks

Clicking in the +add button

[2024-01-09 09:35:30] [   ERROR] - Internal Server Error: /admin/django_celery_beat/crontabschedule/add/ (log.py:241)
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/asgiref/sync.py", line 534, in thread_handler
    raise exc_info[1]
  File "/usr/local/lib/python3.12/site-packages/django/core/handlers/exception.py", line 42, in inner
    response = await get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/asgiref/sync.py", line 534, in thread_handler
    raise exc_info[1]
  File "/usr/local/lib/python3.12/site-packages/django/core/handlers/base.py", line 253, in _get_response_async
    response = await wrapped_callback(
               ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/asgiref/sync.py", line 479, in __call__
    ret: _R = await loop.run_in_executor(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/asgiref/sync.py", line 538, in thread_handler
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/contrib/admin/options.py", line 714, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/utils/decorators.py", line 188, in _view_wrapper
    result = _process_exception(request, e)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/utils/decorators.py", line 186, in _view_wrapper
    response = view_func(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/views/decorators/cache.py", line 80, in _view_wrapper
    response = view_func(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/contrib/admin/sites.py", line 240, in inner
    return view(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/contrib/admin/options.py", line 1941, in add_view
    return self.changeform_view(request, None, form_url, extra_context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/utils/decorators.py", line 48, in _wrapper
    return bound_method(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/utils/decorators.py", line 188, in _view_wrapper
    result = _process_exception(request, e)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/utils/decorators.py", line 186, in _view_wrapper
    response = view_func(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/contrib/admin/options.py", line 1802, in changeform_view
    return self._changeform_view(request, object_id, form_url, extra_context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/contrib/admin/options.py", line 1869, in _changeform_view
    form = ModelForm(initial=initial)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/forms/models.py", line 362, in __init__
    self.instance = opts.model()
                    ^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/db/models/base.py", line 535, in __init__
    val = field.get_default()
          ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/timezone_field/fields.py", line 126, in get_default
    value = super().get_default()
            ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/db/models/fields/__init__.py", line 1027, in get_default
    return self._get_default()
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/models.py", line 60, in crontab_schedule_celery_timezone
    choice[0].zone for choice in timezone_field.TimeZoneField.CHOICES
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'TimeZoneField' has no attribute 'CHOICES'

On startup

celery beat v5.3.6 (emerald-rush) is starting.
__    -    ... __   -        _
LocalTime -> 2024-01-09 10:13:41
Configuration ->
    . broker -> redis://redis:6379/1
    . loader -> celery.loaders.app.AppLoader
    . scheduler -> django_celery_beat.schedulers.DatabaseScheduler

    . logfile -> [stderr]@%INFO
    . maxinterval -> 5.00 seconds (5s)
[2024-01-09 10:13:41,352: INFO/MainProcess] beat: Starting...
[2024-01-09 10:13:41,408: CRITICAL/MainProcess] beat raised exception <class 'AttributeError'>: AttributeError("'zoneinfo.ZoneInfo' object has no attribute 'localize'")
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/celery/apps/beat.py", line 113, in start_scheduler
    service.start()
  File "/usr/local/lib/python3.12/site-packages/celery/beat.py", line 634, in start
    humanize_seconds(self.scheduler.max_interval))
                     ^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/kombu/utils/objects.py", line 40, in __get__
    return super().__get__(instance, owner)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/functools.py", line 995, in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/celery/beat.py", line 677, in scheduler
    return self.get_scheduler()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/celery/beat.py", line 668, in get_scheduler
    return symbol_by_name(self.scheduler_cls, aliases=aliases)(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/schedulers.py", line 231, in __init__
    Scheduler.__init__(self, *args, **kwargs)
  File "/usr/local/lib/python3.12/site-packages/celery/beat.py", line 264, in __init__
    self.setup_schedule()
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/schedulers.py", line 239, in setup_schedule
    self.install_default_entries(self.schedule)
                                 ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/schedulers.py", line 361, in schedule
    self._schedule = self.all_as_schedule()
                     ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/schedulers.py", line 247, in all_as_schedule
    s[model.name] = self.Entry(model, app=self.app)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/schedulers.py", line 93, in __init__
    model.last_run_at = self._default_now()
                        ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django_celery_beat/schedulers.py", line 143, in _default_now
    now = now.tzinfo.localize(now.replace(tzinfo=None))
          ^^^^^^^^^^^^^^^^^^^
AttributeError: 'zoneinfo.ZoneInfo' object has no attribute 'localize'

Also: 'django_celery_beat' have changes that are not yet reflected in a migration.

Running makemigrations created /usr/local/lib/python3.12/site-packages/django_celery_beat/migrations/0015_alter_clockedschedule_id_alter_crontabschedule_id_and_more.py

But the error still persists.

[Nigel2392]

More discussed here: #698

Swapping to older versions of libraries can not only cause security issues - dependency issues, as you are noticing is also a problem. I'm pretty sure ZoneInfo.localize is deprecated in pytz.

[AlexEnrique]

I totally agree. I am just pointing out that the solution to use the lib with Django 5.0 given in #699 is not working.

I would like to contribute more to support the new Django version, but I don't know from where to start (never contributed directly to open source software).

This may be the source of the first issue: Support for pytz timezones was removed in Django 5.0. The second was probably fixed between ver. 2.1.0 and 2.5.0.

[cclauss]

Installing on Dj5.0.x is DOWNGRADING your django-celery-beat as discussed at #698 (comment)

This means that a previously fixed #378 is no longer present.

• Fix breakage caused by change in django-timezone-field #378

A new release to PyPI would fix the issue.

@AlexEnrique Please close this issue as a duplicate of #698 or change the title to:
Installing django-celery-beat on Django v5.0 DOWNGRADES to v2.1.0