Saving a VLANGroup without changes creates a new changelog entry #1156

New Issue

MrUnknownDE · 2026-04-05T21:14:19+02:00

MrUnknownDE commented

2026-04-05 21:14:19 +02:00

Originally created by @pheus on 10/2/2025

NetBox Edition

NetBox Community

NetBox Version

v4.4.2

Python Version

3.12

Steps to Reproduce

Navigate to IPAM → VLAN Groups; create a VLAN group (or open an existing one).
In VLAN ID Ranges, enter a value such as 100-200, 300-300 and click Save.
Reopen the same VLAN group, do not change any fields, and click Save again.
Open the object’s Changelog tab (or Other → Change Log) and filter by this object.

Expected Behavior

No new changelog entry should be created if no fields were changed.

Observed Behavior

A new changelog entry is recorded on each save, even when the form or API payload is identical in meaning. The difference appears isolated to vid_ranges and stems from representation drift:

UI/forms (and CSV import) return inclusive ranges (e.g., NumericRange(lo, hi, bounds='[]')).
PostgreSQL int4range canonicalizes to half‑open [lo, hi) on round‑trip.
Change logging compares serialized pre/post snapshots textually, so these representations don’t match even though the set of VLAN IDs is unchanged.

*Originally created by @pheus on 10/2/2025* ### NetBox Edition NetBox Community ### NetBox Version v4.4.2 ### Python Version 3.12 ### Steps to Reproduce 1. Navigate to **IPAM → VLAN Groups**; create a VLAN group (or open an existing one). 2. In **VLAN ID Ranges**, enter a value such as `100-200, 300-300` and click **Save**. 3. Reopen the same VLAN group, **do not change any fields**, and click **Save** again. 4. Open the object’s **Changelog** tab (or **Other → Change Log**) and filter by this object. ### Expected Behavior No new changelog entry should be created if no fields were changed. ### Observed Behavior A new changelog entry is recorded on each save, even when the form or API payload is identical in meaning. The difference appears isolated to `vid_ranges` and stems from representation drift: - UI/forms (and CSV import) return **inclusive** ranges (e.g., `NumericRange(lo, hi, bounds='[]')`). - PostgreSQL `int4range` canonicalizes to **half‑open** `[lo, hi)` on round‑trip. - Change logging compares serialized pre/post snapshots textually, so these representations don’t match even though the set of VLAN IDs is unchanged.

MrUnknownDE closed this issue

2026-04-05 21:14:19 +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#1156