[Bug]: smart_feeder_desiccant_remaining_days is using native unit of measurement 'None' which is not a valid unit for the device class ('duration')

[bakerkj]

What happened ?

I am getting the following error for the desiccant remaining days sensor

2025-09-03 18:02:16.966 WARNING (MainThread) [homeassistant.components.sensor] Entity sensor.xxxx_smart_feeder_desiccant_remaining_days (<class 'custom_components.petlibro.sensor.PetLibroSensorEntity'>) is using native unit of measurement 'None' which is not a valid unit for the device class ('duration') it is using; expected one of ['min', 's', 'd', 'h', 'ms', 'μs']; 

Relevant log output

.

[C4-Dimitri]

Yeah i am getting this too, i dont know the reason because all of the desiccant sensors are set to use UOM of "d" which is what it suggests...

        PetLibroSensorEntityDescription[GranarySmartFeeder](
            key="remaining_desiccant",
            translation_key="remaining_desiccant",
            icon="mdi:package",
            native_unit_of_measurement="d",
            device_class=SensorDeviceClass.DURATION,
            state_class=SensorStateClass.MEASUREMENT,
            name="Remaining Desiccant Days"
        ),

[C4-Dimitri]

Found the issue, we declare these in a large if statement block at the top of the sensor entity file:

    @property
    def native_unit_of_measurement(self) -> str | None:
        """Return the native unit of measurement to use in the frontend, if any."""
        # For temperature, display as Fahrenheit
        if self.entity_description.key == "temperature":
            return "°F"
        # For today_feeding_quantity or last_feed_quantity, display as cups in the frontend
        if self.entity_description.key in ["today_feeding_quantity","last_feed_quantity"]:
            return "cups"

but these werent included. if we include them it fixes this issue. im adding this to my current open fork, so when i open the PR it will fix this too.

of course we are reworking UOMs anyway, but still probably good to just fix this first.

[jjjonesjr33]

This has been completed in #139