Group is required attribute on Contact object when using REST API

[rodvand]

NetBox version

v3.1-beta1

Python version

3.8

Steps to Reproduce

curl -X POST \
-H "Authorization: Token TOKEN" \
-H "Content-Type: application/json" \
-H "Accept: application/json; indent=4" \
https://NETBOX/api/tenancy/contacts/ \
--data '{
    "name": "Martin"
}'

Expected Behavior

Contact is created.

Observed Behavior

{
    "group": [
        "This field is required."
    ]
}

In the API docs the group attribute is set as required, while it is not (at least visibly) required in the NetBox UI.

Adding "group": null to the curl command allows the contact to be created.

[jeremystretch]

For anyone interested, this is a peculiar quirk of uniqueness validation within DRF. Because the group field is part of a uniqueness constraint, the serializer field must have a value for it (even if that value is null).