CowData.fromEmpty constructor Null safety

Implementation

factory CowData.fromEmpty(Cow cow) => CowData(cow: cow, data: [
      CowDataDay(cowDataHour: [
        CowDataHour(
          hour: 0,
          lactation: CowDataValue(value: 0),
          ruminant: CowDataValue(value: 0),
          eating: CowDataValue(value: 0),
          drinking: CowDataValue(value: 0),
          sitting: CowDataValue(value: 0),
          standing: CowDataValue(value: 0),
          activity: CowDataValue(value: 0),
          cough: CowDataValue(value: 0),
          heading: CowDataValue(value: 0),
          digestive: CowDataValue(value: 0),
          respiratory: CowDataValue(value: 0),
          bcs: CowDataValue(value: 3),
        ),
      ])
    ]);