/api/core/background-tasks/ returns TypeError

[fabi125]

Deployment Type

Self-hosted

NetBox Version

v4.3.6

Python Version

3.12

Steps to Reproduce

1. Go to https://demo.netbox.dev/core/background-queues/0/failed/ and click on any of the failed tasks.
2. Insert /api/ in the URL, e.g. https://demo.netbox.dev/api/core/background-tasks/7a0b851f-b224-46d7-a6b5-8778939eee49/

Expected Behavior

JSON representation of the background task is returned

Observed Behavior

{
  "error": "Object of type Job is not JSON serializable",
  "exception": "TypeError",
  "netbox_version": "4.3.6",
  "python_version": "3.12.9"
}

or

{
  "error": "Object of type EventRule is not JSON serializable",
  "exception": "TypeError",
  "netbox_version": "4.3.6",
  "python_version": "3.12.9"
}

[arthanson]

Can also get the following, repro:

1. install branching but don't have task queue running
2. create a branch
3. Use the REST API explorer to go to core > background tasks

Traceback (most recent call last):
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/django/core/handlers/base.py", line 220, in _get_response
    response = response.render()
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/django/template/response.py", line 114, in render
    self.content = self.rendered_content
                   ^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/response.py", line 74, in rendered_content
    ret = renderer.render(self.data, accepted_media_type, context)
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/renderers.py", line 731, in render
    context = self.get_context(data, accepted_media_type, renderer_context)
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/renderers.py", line 687, in get_context
    'content': self.get_content(renderer, data, accepted_media_type, renderer_context),
               ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/renderers.py", line 417, in get_content
    content = renderer.render(data, accepted_media_type, renderer_context)
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/renderers.py", line 100, in render
    ret = json.dumps(
        data, cls=self.encoder_class,
        indent=indent, ensure_ascii=self.ensure_ascii,
        allow_nan=not self.strict, separators=separators
    )
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/utils/json.py", line 25, in dumps
    return json.dumps(*args, **kwargs)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/python@3.13/3.13.5/Frameworks/Python.framework/Versions/3.13/lib/python3.13/json/__init__.py", line 238, in dumps
    **kw).encode(obj)
          ~~~~~~^^^^^
  File "/opt/homebrew/Cellar/python@3.13/3.13.5/Frameworks/Python.framework/Versions/3.13/lib/python3.13/json/encoder.py", line 200, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/opt/homebrew/Cellar/python@3.13/3.13.5/Frameworks/Python.framework/Versions/3.13/lib/python3.13/json/encoder.py", line 261, in iterencode
    return _iterencode(o, 0)
  File "/Users/ahanson/dev/work/netbox/venv/lib/python3.13/site-packages/rest_framework/utils/encoders.py", line 67, in default
    return super().default(obj)
           ~~~~~~~~~~~~~~~^^^^^
  File "/opt/homebrew/Cellar/python@3.13/3.13.5/Frameworks/Python.framework/Versions/3.13/lib/python3.13/json/encoder.py", line 180, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
                    f'is not JSON serializable')
TypeError: Object of type Job is not JSON serializable