How to improve sensor?

@RalfP wrote:

Hi all,

I have the following working sensor (value_template), but I learned that it should be something with is_state_attr instead of states.sensor.

I just did not figure out the correct syntax for doing so.

  - platform: rest
    resource: http://some.resource.ip.xy
    scan_interval: 10
    name: "sensor_name"
    value_template: "{{ value_json['system.system_info'] }}"
    json_attributes:
      - system
  - platform: template
    sensors:
      oekofen_aussentemp:
        friendly_name: 'some_friendly_name'
        value_template: '{{ (((states.sensor.sensor_name.attributes["system"]["L_ambient"]|int) *0.1) | round(1) )}}'
        unit_of_measurement: "°C"

During startup I get this error message in the log but after some seconds the value is showing up.

Could not render template some_friendly_name: UndefinedError: 'mappingproxy object' has no attribute 'system'

I’ve read https://www.home-assistant.io/docs/configuration/templating/ up and down and other entries in the forum but this is the only working format I can craft.

Help highly appreciated
Ralf

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