Creating a Custom Object Field of type object to another custom objects gives UI recursive error

[cruse1977]

Plugin Version

0.1.0

NetBox Version

4.3.3

Python Version

3.12

Steps to Reproduce

1. Create a custom object type via requests and record its ID. (eg: 5)
2. Create a custom object field of type object, and set the app label to netbox_custom_objects and model to table{ID} model - example payload:

{'name': 'group', 'label': 'VNI Group', 'type': 'object', 'app_label': 'netbox_custom_objects', 'model': 'table5model', 'custom_object_type': 5}

Expected Behavior

Field creates, Able to view/edit/delete Custom Object in UI

Observed Behavior

Field is created, but any action in the UI on this object results in:

[mrmrcoleman]

Reproduced at:

NetBox version: v4.2.8-Docker-3.2.0
Custom Objects version: commit fe4827802c5bed230ac042bfdeba6beb328f1356 (HEAD -> main, origin/main, origin/HEAD)
Author: bctiemann <btiemann@netboxlabs.com>
Date:   Tue Jul 15 10:56:42 2025 -0400

---

1. POST /api/plugins/custom-objects/custom-object-types/

   Body

   {
     "name": "X"
   }
   

   Response

   { "id": 14, "url": "http://localhost:8000/api/plugins/custom-objects/custom-object-types/14/", "name": "X", "description": "", "tags": [], "created": "2025-07-18T13:55:13.045838Z", "last_updated": "2025-07-18T13:55:13.045861Z", "fields": [] }
   

2. POST /api/plugins/custom-objects/custom-object-type-fields/

   Body

   {
     "name": "group",
     "label": "VNI Group",
     "type": "object",
     "app_label": "netbox_custom_objects",
     "model": "table14model",
     "custom_object_type": 14
   }
   

   Response

   {
     "non_field_errors": [
       "Must provide valid app_label and model for object field type."
     ]
   }
   

   Then go look at the Custom Object Type in the GUI:

   <class 'RecursionError'>
   
   maximum recursion depth exceeded
   
   Python version: 3.12.3
   NetBox version: 4.2.8-Docker-3.2.0
   Plugins: 
     netbox_custom_objects: 0.1.0
   

   Note that this also means that the Custom Object Type now cannot be deleted either, leaving the user in a locked state.