toJson method
Implementation
Map toJson(){
Map _result = {};
if (name != null) _result.addAll({"name": name});
if (group != null) _result.addAll({"group": group});
if (status != null) _result.addAll({"status": status});
if (range != null) _result.addAll({"range": range!.toJson()});
if (value != null) _result.addAll({"value": value});
return _result;
}