toMap method
Implementation
Map<String, dynamic> toMap() {
return <String, dynamic>{
'province': province.map((x) => x.toMap()).toList(),
'zone': zone.map((x) => x.toMap()).toList(),
'district': district.map((x) => x.toMap()).toList(),
'localLevel': localLevel.map((x) => x.toMap()).toList(),
};
}