toMap method
Implementation
@override
Map<String, dynamic> toMap() {
Map<String, Object> hashMap = {};
hashMap[fieldCity] = city ?? "";
hashMap[fieldCountry] = country ?? "";
hashMap[fieldLine1] = line1 ?? "";
hashMap[fieldLine2] = line2 ?? "";
hashMap[fieldPostalCode] = postalCode ?? "";
hashMap[fieldState] = state ?? "";
return hashMap;
}