Discussion: Using unit based functions

[fuatakgun]

Current usage:

 vehicle.fuel_driving_range = 
(get_child_value(state,"vehicleStatus.dte.value",),DISTANCE_UNITS[get_child_value(state, "vehicleStatus.dte.unit")])


vehicle.ev_target_range_charge_DC = (
            get_child_value(
                state,
                "vehicleStatus.evStatus.reservChargeInfos.targetSOClist.0.dte.rangeByFuel.totalAvailableRange.value",
            ),
            DISTANCE_UNITS[
                get_child_value(
                    state,
                    "vehicleStatus.evStatus.reservChargeInfos.targetSOClist.0.dte.rangeByFuel.totalAvailableRange.unit",
                )
            ],
        )

New proposal:

@dataclass
class UnitMapper:
  value_field: str
  unit_field: str = None
  def __post_init__(self):
        if self.unit_field is None:
          splitted = self.value_field.rsplit(".", 1)
          splitted[1] = "unit"
          self.unit_field = ".".join(b)

class UnitBasedFieldDefinition(Enum):
  fuel_driving_range= UnitMapper("vehicleStatus.dte.value")
  ev_target_range_charge_DC= UnitMapper("vehicleStatus.evStatus.reservChargeInfos.targetSOClist.0.dte.rangeByFuel.totalAvailableRange.value")
  some_other = UnitMapper("vehicleStatus.field","VehicleStatus.some_other_unit_field")

for key, value in UnitBasedFieldDefinition:
  setattr(vehicle, key, get_child_value(value.value_field), get_child_value(value.unit_field))