TypeError: JobModel.__init__() missing 8 required keyword-only arguments: 'name', 'created_at', 'args', 'kwargs', 'queue_name', 'descript on', 'func_name', and 'meta'

[danjac]

Describe the bug

When clicking on a Task detail in Django admin e.g. http://localhost/scheduler/task/3/change/ I get this error:

TypeError: JobModel.init() missing 8 required keyword-only arguments: 'name', 'created_at', 'args', 'kwargs', 'queue_name', 'descript on', 'func_name', and 'meta'

Note that tasks were imported e.g.

  {
    "model": "CronTaskType",
    "name": "My job",
    "callable": "my_job_callable",
    "callable_args": [],
    "callable_kwargs": [],
    "enabled": true,
    "queue": "default",
    "repeat": null,
    "at_front": false,
    "timeout": null,
    "result_ttl": null,
    "cron_string": "15 3 * * *",
    "scheduled_time": "2025-06-21T03:15:00+00:00",
    "interval": null,
    "interval_unit": "hours",
    "successful_runs": 0,
    "failed_runs": 0,
    "last_successful_run": null,
    "last_failed_run": null
  }

Desktop (please complete the following information):

• OS: Ubuntu
• Python 3.13
• Django 5.2.3
• django-tasks-scheduler 4.0.4

[danjac]

Also seeing same error running the command delete_failed_executions

  File "/app/manage.py", line 24, in <module>
    main()
    ~~~~^^
  File "/app/manage.py", line 20, in main
    execute_from_command_line(sys.argv)
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/app/.venv/lib/python3.13/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
    ~~~~~~~~~~~~~~~^^
  File "/app/.venv/lib/python3.13/site-packages/django/core/management/__init__.py", line 436, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/app/.venv/lib/python3.13/site-packages/django/core/management/base.py", line 416, in run_from_argv
    self.execute(*args, **cmd_options)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib/python3.13/site-packages/django/core/management/base.py", line 460, in execute
    output = self.handle(*args, **options)
  File "/app/.venv/lib/python3.13/site-packages/scheduler/management/commands/delete_failed_executions.py", line 19, in handle
    jobs = JobModel.get_many(job_names, connection=queue.connection)
  File "/app/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 180, in get_many
    return [(cls.deserialize(decode_dict(v, set())) if v else None) for v in values]
             ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib/python3.13/site-packages/scheduler/redis_models/job.py", line 179, in deserialize
    res = super(JobModel, cls).deserialize(data)
  File "/app/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 113, in deserialize
    return cls(**data)
TypeError: JobModel.__init__() missing 8 required keyword-only arguments: 'name', 'created_at', 'args', 'kwargs', 'queue_name', 'description', 'func_name', and 'meta'

[danjac]

This looks like an issue with some stale queues in Redis from old fields; full Redis restart fixed it.

[cunla]

This looks like an issue with some stale queues in Redis from old fields; full Redis restart fixed it.

If I understand correctly, you upgraded django-tasks-scheduler and after upgrade, you had this error because of left overs from previous versions in Redis?

[danjac]

Yes, this would appear to be the case.

[cunla]

I think it happens only in the case of upgrading from 3.x to 4.x (breaking change) - so I don't think it is worthwhile addressing this.