Can event rule constraints reference parent?

[dpotter-intoto]

I am trying to author an event rule that triggers when interfaces are created for a specific device-type.

I reviewed the graphql explorer as a potential source to identify what fields could be used as constraints, and came up with this syntax:

{
    "and": [
        {
            "attr": "parent.device.device_type.slug",
            "op": "eq",
            "value": "smoke-test"
        }
    ]
}

But it doesn't seem to be triggering. It does work for dcim.device objects (without parent.device), but not dcim.interface objects.

Two questions:

• any recommendations on how to achieve what I want?
• What is a good source for finding the available fields I can reference in constraints?

[dpotter-intoto]

Also tried device.device_type.slug and interface.device.device_type.slug. Thinking this might not be possible.

[dpotter-intoto]

I couldn't find a way to do this, so I removed the constraint entirely and had the event rule trigger on all interface creations. I allowed the underlying script to apply the constraint.

Computationally inefficient, but it's the only solution I could find.