Cannot create Vlan-Group with site_id, also create vlan in vlan-group (with group option)

[Vadims06]

Environment

• Python version: 3.6.8
• NetBox version: 2.8.0

Attempt to create vlan-group with site attribute using POST method.
Attempt to create vlan inside vlan-group using group attribute in POST method.

Steps to Reproduce

1. Make POST request with 'site' attribute for creating vlan-group with data = {'name': 'vlan_group_name', 'slug': 'vlan_group_name', 'site': site_id_of any site}.
2. Make POST request to create vlan inside vlan-group using group attribute, e.x. data = {'vid': 1, "name": 'default, "site": site_id_of any site, 'group': vlan_group_id}

Expected Behavior

1. Creation of vlan-group in site
2. Creation a vlan inside vlan-group

Observed Behavior

I get the following error
'UniqueTogetherValidator' object has no attribute &#x27 them I make both POSTs

[DouglasHeriot]

This is a duplicate of #4496, just fixed in the recent v2.8.1 release