Plugin Foreign Key Form Filter with DynamicModelChoiceField

[cslingerland]

I have a field that I want to behave similarly to how the Device Types / Manufactures do in the form where when you choose a Manufacturer, the Device Type field is filtered.

My Relationship model has a foreign key into my Vendor model, and it also has a foreign key to IPAddress
My Vendor model has a foreign key to the Prefix model.

When creating a relationship, I'd like to filter what IPs are available to choose from based on the prefix that is assigned to the vendor. Is this possible or are the query_params not going to work that way with this level of nesting?

I am able to "manually" accomplish this by writing a custom Edit view and then filtering the query before passing it to the form as follows:
ipaddresses = IPAddress.objects.filter(address__net_host_contained=str(prefix.prefix))

I'd like to have similar functionality using the built-in netbox code. I'm open to suggestions.

Here's my stab at getting this to work but it's not functional.

ip = DynamicModelChoiceField(
    queryset=IPAddress.objects.all(),
    required=False,
    label=('NAT IP Address'),
    query_params={
        'address__net_host_contained': '$vendor_prefix_prefix'
    }
)

[cslingerland]

It's appearing like this isn't possible. Is anyone able to confirm?