Netbox api call /dcim/devices/ virtual chassis does not have "member_count"

[PaulWestphal]

NetBox version

v3.2.2

Python version

3.8

Steps to Reproduce

1. Create any number of devices and a virtual chassis.
2. Add the devices to the virtual chassis.
3. Send a GET HTTP request to http://netbox-address-here/api/dcim/devices/

Expected Behavior

According to the documentation, the "virtual_chassis" of each of the created devices should have a field "member_count".

Observed Behavior

There is no "member_count".

[DanSheps]

You need to query the virtual chassis, not the device.

[DanSheps]

Thank you for opening a bug report. It seems that the described functionality is intended behavior. If you meant to open a feature request instead, please close this issue and open a new one using the feature request template. Otherwise, please revise your post above to elaborate on why you believe the observed behavior is flawed.

[PaulWestphal]

The example value from /dcim/devices/ has the member_count in it. You can check the documentation yourself.

{

  "count": 0,

  "next": "string",

  "previous": "string",

  "results": [

    {

      "id": 0,

      "url": "string",

      "display": "string",

      "name": "string",

      "device_type": {

        "id": 0,

        "url": "string",

        "display": "string",

        "manufacturer": {

          "id": 0,

          "url": "string",

          "display": "string",

          "name": "string",

          "slug": "string",

          "devicetype_count": 0

       [...]

      "virtual_chassis": {

        "id": 0,

        "url": "string",

        "display": "string",

        "name": "string",

        "master": {

          "id": 0,

          "url": "string",

          "display": "string",

          "name": "string"

        },

        "member_count": 0  <-----------

      },

      "vc_position": 0,

      "vc_priority": 0,

      "comments": "string",

      "local_context_data": "string",

     [...]

      },

      "created": "2022-05-10T14:42:55.190Z",

      "last_updated": "2022-05-10T14:42:55.190Z"

    }

  ]

}

[DanSheps]

You are correct, it is on the serializer.

I am currently looking into this as it may be related to the field not being annotated when the query resolves.

[jeremystretch]

This isn't a bug. The member_count field is omitted from the serializer because that data is not available when querying the devices list. (Annotating it would require unduly expensive queries.) It is intended for use and present when retrieving virtual chassis directly in either full or brief mode:

GET /api/dcim/virtual-chassis/?brief=True

{
    "count": 4,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": 1,
            "url": "http://netbox:8000/api/dcim/virtual-chassis/1/",
            "display": "r105-torsw",
            "name": "r105-torsw",
            "master": {
                "id": 98,
                "url": "http://netbox:8000/api/dcim/devices/98/",
                "display": "r105-torsw:1 (98)",
                "name": null
            },
            "member_count": 2
        },
...

[PaulWestphal]

In that case, the API documentation of /dcim/devices/ should be changed. Because it still states that there should be a member_count field.