Unable to Create Circuit Terminations with interface via API

[ohthateverest]

Issue type

[ ] Feature request
[X] Bug report
[ ] Documentation

Environment

• Python version: 3.6.3
• NetBox version: 2.4.4

Steps to Reproduce

Create new circuit termination via the api (/api/circuits/circuit-terminations/) using the following POST Body:

{   "circuit" : 28,
    "term_side": "A",
    "interface": 161,
    "site" : 11,
    "port_speed" : "1000"
}

Also attempted it with a dictionary for the interface after getting the first error using the following body:

{   "circuit" : 28,
    "term_side": "A",
    "interface": {
        "id": 161,
        "device": 91,
        "name": "irb.884"
    },
    "site" : 11,
    "port_speed" : "1000"
}

Expected Behavior

Prior to 2.4 (2.3.6 specifically) the following POST Body would create an A side termination and return the ID and relevant information in the response body.

Observed Behavior

The API returns the following reponse:

{
    "interface": {
        "non_field_errors": [
            "Invalid data. Expected a dictionary, but got int."
        ]
    }
}

Trying the Second the body with the interface dictionary returns the following response.

{
    "interface": {
        "non_field_errors": [
            "The fields device, name must make a unique set."
        ]
    }
}

I can create the termination without the interface just fine and can create it via the Web UI without an issue either, I have looked at the DCIM.Interfaces Serializer and Models but my level of understanding in Django is not as deep as I would like to be able to identify what is causing this.

[ohthateverest]

I applied the patch from PR #2539 and verified its working fine now. Ive applied it to our dev environment for now but will more than likely apply it to prod manually until the PR is merged.