Path tracing broken for front/rear ports in REST API

[srfwx]

Deployment Type

Self-hosted

NetBox Version

v4.2.6

Python Version

3.12

Steps to Reproduce

1. Go to https://[SERVER_URL]/api/dcim/rear-ports/
2. Select any existing port by clicking on its "url"
3. The REST API now display the data for a single port, for example:
   https://[SERVER_URL]/api/dcim/rear-ports/70479/
4. Append "paths/" to this URL: https://[SERVER_URL]/api/dcim/rear-ports/70479/paths

Expected Behavior

The REST API should return the CablePaths which traverse the given pass-through port.

Observed Behavior

'AttributeError' is raised.

'NoneType' object has no attribute 'model'

This error is not observed on NetBox 4.2.5
I believe this may have been introduced by #18826 ?

[jnovinger]

Looking at this now. It appears to work in the feature branch. Not sure what might have "fixed" it. Ah, I think it's as simple as the work for #18826 hasn't been included in feature yet.