AttributeError in ObjectChangeViewSet browsable API: 'NoneType' object has no attribute 'model' #1014

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MrUnknownDE · 2026-04-05T19:48:31+02:00

MrUnknownDE commented

2026-04-05 19:48:31 +02:00

Originally created by @jnovinger on 10/21/2025

NetBox Edition: NetBox Community

NetBox Version: v4.4.4

Python Version: 3.12

Steps to Reproduce:

Navigate to http://127.0.0.1:8000/api/core/object-changes/ in a web browser (Firefox, Chrome, Safari)
Observe the AttributeError

Alternatively, reproduce via curl:

curl 'http://127.0.0.1:8000/api/core/object-changes/' \
  -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'

Expected Behavior:

The browsable API page should render with the list of object changes.

Observed Behavior:

The request fails with an AttributeError:

AttributeError at /api/core/object-changes/
'NoneType' object has no attribute 'model'

Exception Location: /path/to/netbox/utilities/api.py, line 77, in get_view_name

The API endpoint functions correctly when accessed with Accept: application/json or with the ?format=json query parameter. The bug only appears to affect HTML rendering for browser access.

*Originally created by @jnovinger on 10/21/2025* **NetBox Edition**: NetBox Community **NetBox Version**: v4.4.4 **Python Version**: 3.12 **Steps to Reproduce**: 1. Navigate to `http://127.0.0.1:8000/api/core/object-changes/` in a web browser (Firefox, Chrome, Safari) 2. Observe the AttributeError Alternatively, reproduce via curl: ```bash curl 'http://127.0.0.1:8000/api/core/object-changes/' \ -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' ``` **Expected Behavior**: The browsable API page should render with the list of object changes. **Observed Behavior**: The request fails with an AttributeError: ``` AttributeError at /api/core/object-changes/ 'NoneType' object has no attribute 'model' Exception Location: /path/to/netbox/utilities/api.py, line 77, in get_view_name ``` The API endpoint functions correctly when accessed with `Accept: application/json` or with the `?format=json` query parameter. The bug only appears to affect HTML rendering for browser access.

MrUnknownDE closed this issue

2026-04-05 19:48:31 +02:00

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Branches Tags

main

21455-sql-indexes-audit

21357-register-model-actions

feature

20924-plugin-ui-components

21766-improve-test-coverage-for-sortable-table-columns

21157-export-template-public-models

21025-pre-render-config-contexts

21364-swagger

feature-ip-prefix-link

20911-dropdown-3

fix_module_substitution

21160-filterset

20911-dropdown-2

20044-elevation-stuck-lightmode

7604-filter-modifiers-v3

20660-script-load

19724-graphql

14884-script

19720-macaddress-interface-generic-relation

fix-19669-api-image-download

7604-filter-modifiers

19275-fixes-interface-bulk-edit

fix-17794-get_field_value_return_list

11507-show-aggregate-and-rir-on-api

9583-add_column_specific_search_field_to_tables

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Reference: github/netbox#1014