Generalising dashboards to preferred mobile device from configuration.yaml, not a named device

Configuration Frontend
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1

What I am trying to achieve: I occasionally get a new mobile phone. If and when I do, I am trying to avoid having to search/replace or rewrite all my YAML.

What I have tried: I created a list of people and their devices in configuration.yaml, example:

group:
  # for each user, defining list of each user' devices so that primary device
  # only needs to be set once (hopefully) in dashboards and such
  user_devices_ndrs:
    name: nrds' devices
    entities:
      - device_tracker.ndrs_pixel_9_pro_xl
      - device_tracker.ndrs_samsung_flip_phone

etc

Then, in a dashboard card config, I have tried referencing the “top” device like so:

type: custom:stack-in-card
card_mod:
  style: |
    ha-card {
      {# Get the first device tracker entity from the 'user_devices_ndrs' group. #}
      {% set device_tracker_entity = state_attr('group.user_devices_ndrs', 'entity_id')[0] %}
      {% set longitude = state_attr(device_tracker_entity, 'longitude') | float(0) %}
      {% set latitude = state_attr(device_tracker_entity, 'latitude') | float(0) %}

This does not seem to work. Is there any best practice for solving this use case (except “have only one phone at a time and call it ‘phone’” or similar? :slight_smile:

2

Sorry, what do you expect to work here?
You posted a card-mod code w/o an eclosing “}” bracket & w/o any css styles.
Just declared a couple of variables which were not used.
Do you know what card-mod does? It sets css properties of some UI element like color, border etc.